Data transmission method and reception method for wireless communication system and device using same

ABSTRACT

A base station of a wireless communication system is disclosed. The base station of the wireless communication includes a communication module; and a processor configured to control the communication module. The processor receives a radio resource control (RRC) signal from a base station of the wireless communication system through the communication module and determines a time-frequency resource corresponding to at least one resource-set indicated by the RRC signal. The processor receives a physical control channel from the base station through the communication module, determines a time-frequency resource domain in which physical data channel reception of the terminal is scheduled by the physical control channel, and receives a physical data channel based on a time-frequency resource in which the physical data channel reception of the terminal is scheduled and a time-frequency resource in which the at least one resource-set overlap. The resource-set is a set of time-frequency resources.

TECHNICAL FIELD

The present invention relates to a wireless communication system.Specifically, the present invention relates to a data transmissionmethod, a reception method, and a device using the same in a wirelesscommunication system.

BACKGROUND ART

After commercialization of 4th generation (4G) communication system, inorder to meet the increasing demand for wireless data traffic, effortsare being made to develop new 5th generation (5G) communication systems.The 5G communication system is called as a beyond 4G networkcommunication system, a post LTE system, or a new radio (NR) system. Inorder to achieve a high data transfer rate, 5G communication systemsinclude systems operated using the millimeter wave (mmWave) band of 6GHz or more, and include a communication system operated using afrequency band of 6 GHz or less in terms of ensuring coverage so thatimplementations in base stations and terminals are under consideration.

A 3rd generation partnership project (3GPP) NR system enhances spectralefficiency of a network and enables a communication provider to providemore data and voice services over a given bandwidth. Accordingly, the3GPP NR system is designed to meet the demands for high-speed data andmedia transmission in addition to supports for large volumes of voice.The advantages of the NR system are to have a higher throughput and alower latency in an identical platform, support for frequency divisionduplex (FDD) and time division duplex (TDD), and a low operation costwith an enhanced end-user environment and a simple architecture.

For more efficient data processing, dynamic TDD of the NR system may usea method for varying the number of orthogonal frequency divisionmultiplexing (OFDM) symbols that may be used in an uplink and downlinkaccording to data traffic directions of cell users. For example, whenthe downlink traffic of the cell is larger than the uplink traffic, thebase station may allocate a plurality of downlink OFDM symbols to a slot(or subframe). Information about the slot configuration should betransmitted to the terminals.

In order to alleviate the path loss of radio waves and increase thetransmission distance of radio waves in the mmWave band, in 5Gcommunication systems, beamforming, massive multiple input/output(massive MIMO), full dimensional MIMO (FD-MIMO), array antenna, analogbeam-forming, hybrid beamforming that combines analog beamforming anddigital beamforming, and large scale antenna technologies are discussed.In addition, for network improvement of the system, in the 5Gcommunication system, technology developments related to evolved smallcells, advanced small cells, cloud radio access network (cloud RAN),ultra-dense network, device to device communication (D2D), vehicle toeverything communication (V2X), wireless backhaul, non-terrestrialnetwork communication (NTN), moving network, cooperative communication,coordinated multi-points (CoMP), interference cancellation, and the likeare being made. In addition, in the 5G system, hybrid FSK and QAMmodulation (FQAM) and sliding window superposition coding (SWSC), whichare advanced coding modulation (ACM) schemes, and filter bankmulti-carrier (FBMC), non-orthogonal multiple access (NOMA), and sparsecode multiple access (SCMA), which are advanced connectivitytechnologies, are being developed.

Meanwhile, in a human-centric connection network where humans generateand consume information, the Internet has evolved into the Internet ofThings (IoT) network, which exchanges information among distributedcomponents such as objects. Internet of Everything (IoE) technology,which combines IoT technology with big data processing technologythrough connection with cloud servers, is also emerging. In order toimplement IoT, technology elements such as sensing technology,wired/wireless communication and network infrastructure, serviceinterface technology, and security technology are required, so that inrecent years, technologies such as sensor network, machine to machine(M2M), and machine type communication (MTC) have been studied forconnection between objects. In the IoT environment, an intelligentinternet technology (IT) service that collects and analyzes datagenerated from connected objects to create new value in human life canbe provided. Through the fusion and mixture of existing informationtechnology (IT) and various industries, IoT can be applied to fieldssuch as smart home, smart building, smart city, smart car or connectedcar, smart grid, healthcare, smart home appliance, and advanced medicalservice.

Accordingly, various attempts have been made to apply the 5Gcommunication system to the IoT network. For example, technologies suchas a sensor network, a machine to machine (M2M), and a machine typecommunication (MTC) are implemented by techniques such as beamforming,MIMO, and array antennas. The application of the cloud RAN as the bigdata processing technology described above is an example of the fusionof 5G technology and IoT technology. Generally, a mobile communicationsystem has been developed to provide voice service while ensuring theuser's activity.

However, the mobile communication system is gradually expanding not onlythe voice but also the data service, and now it has developed to theextent of providing high-speed data service. However, in a mobilecommunication system in which services are currently being provided, amore advanced mobile communication system is required due to a shortagephenomenon of resources and a high-speed service demand of users.

DISCLOSURE Technical Problem

An object of an embodiment of the present invention is to provide amethod and device for transmitting a signal efficiently in a wirelesscommunication system. Another object of an embodiment of the presentinvention is to provide a data transmission method, a reception method,and a device using the same in a wireless communication system.

Technical Solution

A terminal of a wireless communication system according to an embodimentof the present invention includes: a communication module; and aprocessor configured to control the communication module. The processoris configured to receive a radio resource control (RRC) signal from abase station of the wireless communication system through thecommunication module, determine a time-frequency resource correspondingto at least one resource-set indicated by the RRC signal, receive aphysical control channel from the base station through the communicationmodule, determine a time-frequency resource domain in which physicaldata channel reception of the terminal is scheduled by the physicalcontrol channel, and receive a physical data channel based on atime-frequency resource in which the physical data channel reception ofthe terminal is scheduled and a time-frequency resource in which the atleast one resource-set overlap. The resource-set is a set oftime-frequency resources.

The overlapping time-frequency resource may be divided into a pluralityof sub-resource-sets. The processor may be configured to obtain arate-matching indicator indicating whether the physical data channelreception is unavailable for each of the plurality of sub-resource-setsfrom the physical control channel, and receive the physical data channelby determining whether the physical data channel reception isunavailable in a time-frequency resource corresponding to asub-resource-set for each of the sub-resource-set according to therate-matching indicator.

The sub-resource-set may be divided based on a frequency domain amongthe overlapping time-frequency resources without distinction in a timedomain.

The at least one resource-set may be respectively identified by indiceswhich are different from each other. The rate-matching indicator may becomposed of a plurality of bits, and a sub-resource-set indicated byeach of the plurality of bits may be determined based on the indicies.

When the time-frequency resource in which the physical data channelreception of the terminal is scheduled and all of the at least oneresource-set do not overlap, the processor may be configured to receivethe physical data channel in a time-frequency resource domain in whichthe reception of the physical data channel of the terminal is scheduled,regardless of the rate-matching indicator.

The physical control channel may be received in a first slot. When atime-frequency resource in which a physical data channel is scheduledand the at least one resource-set overlap in a second slot in which thephysical data channel is received, the processor may be configured toperform rate matching to receive the physical data channel in atime-frequency resource, in a time-frequency resource in which thephysical data channel is scheduled in the second slot, except for atime-frequency resource in which a time-frequency resource in which theat least one resource-set overlaps with a time-frequency in which thephysical data channel is scheduled. In this case, the first slot and thesecond slot may be different from each other.

A terminal of a wireless communication system according to an embodimentof the present invention includes: a communication module; and aprocessor configured to control the communication module. The processoris configured to receive a physical control channel, and when physicaldata channel reception of the terminal is scheduled by the physicalcontrol channel in a plurality of slots, receive the physical datachannel based on a constant orthogonal frequency division multiplexing(OFDM) symbol position in all slots in which the physical data channelis transmitted.

The physical control channel may be transmitted in a first slot. Theprocessor may be configured to receive a radio resource control (RRC)signal from a base station of the wireless communication system throughthe communication module and determine a time-frequency resourcecorresponding to at least one resource-set indicated by the RRC signal,and when a time-frequency resource in which the physical data channel isscheduled and the at least one resource-set overlap in a second slotincluded in the plurality of slots, perform rate matching to receive thephysical data channel in a time-frequency resource except for atime-frequency resource in which the physical data channel is scheduledin the second slot and a time-frequency resource in which the at leastone resource-set overlaps. The first slot and the second slot may bedifferent from each other.

A location of a time-frequency resource corresponding to a resource setin which physical data channel reception is unavailable in each of theplurality of slots may be the constant. Rate matching may be performedto receive a physical data channel in a time-frequency resource exceptfor a time-frequency resource corresponding to the location in atime-frequency resource corresponding to the physical data channelscheduled in each of the plurality of slots.

The OFDM symbol location may be indicated by the physical controlchannel.

An operation method of a terminal of a wireless communication systemaccording to an embodiment of the present invention includes: receivinga radio resource control (RRC) signal from a base station of thewireless communication system through the communication module;determining a time-frequency resource corresponding to at least oneresource-set indicated by the RRC signal; receiving a physical controlchannel from the base station through the communication module;determining a time-frequency resource domain in which physical datachannel reception of the terminal is scheduled by the physical controlchannel; and receiving a physical data channel based on a time-frequencyresource in which physical data channel reception of the terminal isscheduled and a time-frequency resource in which the at least oneresource-set overlaps. The resource-set is a set of time-frequencyresources.

The overlapping time-frequency resource may be divided into a pluralityof sub-resource-sets. The determining the time-frequency resource domainin which the physical data channel reception of the terminal isscheduled by the physical control channel may include obtaining arate-matching indicator indicating whether the physical data channelreception is unavailable for each of the plurality of sub-resource-setsfrom the physical control channel. The receiving the physical datachannel may include receiving the physical data channel by determiningwhether the physical data channel reception is unavailable in atime-frequency resource corresponding to a sub-resource-set for each ofthe sub-resource-set according to the rate-matching indicator.

The sub-resource-set may be divided based on a frequency domain amongthe overlapping time-frequency resources without distinction in a timedomain.

The at least one resource-set may be respectively identified by indiceswhich are different from each other. The rate-matching indicator may becomposed of a plurality of bits, and a sub-resource-set indicated byeach of the plurality of bits may be determined based on the index.

The receiving the physical data channel may include, when thetime-frequency resource in which the physical data channel reception ofthe terminal is scheduled and all of the at least one resource-set donot overlap, receiving the physical data channel in a time-frequencyresource domain in which the reception of the physical data channel ofthe terminal is scheduled, regardless of the rate-matching indicator.

The physical control channel may be received in a first slot. Thereceiving the physical data channel may include, when a time-frequencyresource in which a physical data channel is scheduled and the at leastone resource-set overlap in a second slot in which the physical datachannel is received, performing rate matching to receive the physicaldata channel in a time-frequency resource except for a time-frequencyresource in which a time-frequency resource in which the at least oneresource-set overlaps with a time-frequency in which the physical datachannel is scheduled in a time-frequency resource in which a physicaldata channel is scheduled in the second slot. The first slot and thesecond slot may be different from each other.

An operation method of a terminal of a wireless communication systemaccording to an embodiment of the present invention includes: receivinga physical control channel; and when physical data channel reception ofthe terminal is scheduled by the physical control channel in a pluralityof slots, receiving the physical data channel based on a constantorthogonal frequency division multiplexing (OFDM) symbol position in allslots in which the physical data channel is transmitted.

The physical control channel may be transmitted in a first slot. Theoperation method may further include receiving a radio resource control(RRC) signal from a base station of the wireless communication systemthrough the communication module and determining a time-frequencyresource corresponding to at least one resource-set indicated by the RRCsignal.

The receiving the physical data channel may include, when atime-frequency resource in which the physical data channel is scheduledand the at least one resource-set overlap in a second slot included inthe plurality of slots, performing rate matching to receive the physicaldata channel in a time-frequency resource except for a time-frequencyresource in which the physical data channel is scheduled in the secondslot and a time-frequency resource in which the at least oneresource-set overlaps. The first slot and the second slot may bedifferent from each other.

A location of a time-frequency resource corresponding to a resource setin which physical data channel reception is unavailable in each of theplurality of slots may be constant. The receiving the physical datachannel may include performing rate matching to receive a physical datachannel in a time-frequency resource except for a time-frequencyresource corresponding to the location in a time-frequency resourcecorresponding to the physical data channel scheduled in each of theplurality of slots.

The OFDM symbol location may be indicated by the physical controlchannel.

Advantageous Effects

An embodiment of the present invention provides a method for efficientlytransmitting data, a method of receiving data, and a device using thesame in a wireless communication system.

Effects obtainable from various embodiments of the present disclosureare not limited to the above-mentioned effects, and other effects notmentioned above may be clearly derived and understood to those skilledin the art from the following description.

DESCRIPTION OF DRAWINGS

FIG. 1 illustrates an example of a wireless frame structure used in awireless communication system;

FIG. 2 illustrates an example of a downlink (DL)/uplink (UL) slotstructure in a wireless communication system;

FIG. 3 is a diagram for explaining a physical channel used in a 3GPPsystem and a typical signal transmission method using the physicalchannel;

FIG. 4 illustrates an SS/PBCH block for initial cell access in a 3GPP NRsystem;

FIG. 5 illustrates a procedure for transmitting control information anda control channel in a 3GPP NR system;

FIG. 6 illustrates a control resource set (CORESET) in which a physicaldownlink control channel (PUCCH) may be transmitted in a 3GPP NR system;

FIG. 7 illustrates a method for configuring a PDCCH search space in a3GPP NR system;

FIG. 8 is a conceptual diagram illustrating carrier aggregation;

FIG. 9 is a diagram for explaining signal carrier communication andmultiple carrier communication;

FIG. 10 is a diagram showing an example in which a cross carrierscheduling technique is applied;

FIG. 11 is a block diagram showing the configurations of a UE and a basestation according to an embodiment of the present disclosure;

FIG. 12 illustrates a resource-set used in a wireless communicationsystem according to an embodiment of the present invention.

FIG. 13 illustrates a time-frequency resource domain in which a PDSCH istransmitted in a wireless communication system according to anembodiment of the present invention.

FIG. 14 illustrates a time-frequency resource domain in which a PDSCH istransmitted in a wireless communication system according to anembodiment of the present invention.

FIGS. 15 to 16 illustrate that a terminal of a wireless communicationsystem according to an embodiment of the present invention receives aPDSCH in a RESET configured for a terminal.

FIG. 17 illustrates that a terminal receives a PDSCH when cross-slotscheduling is performed in a wireless communication system according toan embodiment of the present invention.

FIGS. 18 and 19 illustrates that a terminal receives a PDSCH when thescheduling based on the slot-aggregation is performed in a wirelesscommunication system according to an embodiment of the presentinvention.

FIG. 20 illustrates an example of a sub-resource-set used in a wirelesscommunication system according to an embodiment of the presentinvention.

FIG. 21 illustrates that a terminal receives a PDSCH based onoverlapped-RESET in a wireless communication system according to anembodiment of the present invention.

FIGS. 22 to 24 illustrate a case in which time-frequency resourcesindicated as occupied by different RESETs overlap.

FIG. 25 illustrates a slot configuration used in a wirelesscommunication system according to an embodiment of the presentinvention.

FIG. 26 illustrates that a UE-specific PDCCH indicates a scheduledresource to a terminal in a wireless communication system according toan embodiment of the present invention.

FIG. 27 illustrates that a base station transmits two RIVs to a terminalto indicate a scheduled time frequency domain to the terminal in awireless communication system according to an embodiment of the presentinvention.

FIG. 28 illustrates that a base station transmits two RIVs to a terminalto indicate a scheduled time frequency domain to the terminal in awireless communication system according to an embodiment of the presentinvention.

FIGS. 29 to 33 illustrate an OFDM symbol corresponding to a physicaldata channel scheduled for a terminal represented by 6 bits of an RRCsignal in a wireless communication system according to anotherembodiment of the present invention.

MODE FOR CARRYING OUT THE INVENTION

Terms used in the specification adopt general terms which are currentlywidely used as possible by considering functions in the presentinvention, but the terms may be changed depending on an intention ofthose skilled in the art, customs, and emergence of new technology.Further, in a specific case, there is a term arbitrarily selected by anapplicant and in this case, a meaning thereof will be described in acorresponding description part of the invention. Accordingly, it intendsto be revealed that a term used in the specification should be analyzedbased on not just a name of the term but a substantial meaning of theterm and contents throughout the specification.

Throughout this specification and the claims that follow, when it isdescribed that an element is “connected” to another element, the elementmay be “directly connected” to the other element or “electricallyconnected” to the other element through a third element. Further, unlessexplicitly described to the contrary, the word “comprise” will beunderstood to imply the inclusion of stated elements but not theexclusion of any other elements unless otherwise stated. Moreover,limitations such as “more than or equal to” or “less than or equal to”based on a specific threshold may be appropriately substituted with“more than” or “less than”, respectively, in some exemplary embodiments.

The following technology may be used in various wireless access systems,such as code division multiple access (CDMA), frequency divisionmultiple access (FDMA), time division multiple access (TDMA), orthogonalfrequency division multiple access (OFDMA), single carrier-FDMA(SC-FDMA), and the like. The CDMA may be implemented by a wirelesstechnology such as universal terrestrial radio access (UTRA) orCDMA2000. The TDMA may be implemented by a wireless technology such asglobal system for mobile communications (GSM)/general packet radioservice (GPRS)/enhanced data rates for GSM evolution (EDGE). The OFDMAmay be implemented by a wireless technology such as IEEE 802.11 (Wi-Fi),IEEE 802.16 (WiMAX), IEEE 802-20, evolved UTRA (E-UTRA), and the like.The UTRA is a part of a universal mobile telecommunication system(UMTS). 3rd generation partnership project (3GPP) long term evolution(LTE) is a part of an evolved UMTS (E-UMTS) using evolved-UMTSterrestrial radio access (E-UTRA) and LTE-advanced (A) is an evolvedversion of the 3GPP LTE. 3GPP new radio (NR) is a system designedseparately from LTE/LTE-A, and is a system for supporting enhancedmobile broadband (eMBB), ultra-reliable and low latency communication(URLLC), and massive machine type communication (mMTC) services, whichare requirements of IMT-2020. For the clear description, 3GPP NR ismainly described, but the technical idea of the present invention is notlimited thereto.

Unless otherwise specified in this specification, a base station mayrefer to a next generation node B (gNB) as defined in 3GPP NR.Furthermore, unless otherwise specified, a terminal may refer to a userequipment (UE).

Unless otherwise specified herein, the base station may include a nextgeneration node B (gNB) defined in 3GPP NR. Furthermore, unlessotherwise specified, a terminal may include a user equipment (UE).Hereinafter, in order to help the understanding of the description, eachcontent is described separately by the embodiments, but each embodimentmay be used in combination with each other. In the presentspecification, the configuration of the UE may indicate a configurationby the base station. In more detail, the base station may configure avalue of a parameter used in an operation of the UE or a wirelesscommunication system by transmitting a channel or a signal to the UE.

FIG. 1 illustrates an example of a wireless frame structure used in awireless communication system.

Referring to FIG. 1, the wireless frame (or radio frame) used in the3GPP NR system may have a length of 10 ms (Δf_(max)N_(f)/100)*T_(c)). Inaddition, the wireless frame includes 10 subframes (SFs) having equalsizes. Herein, Δf_(max)=480*10³ Hz, N_(f)=4096,T_(c)=1/(Δf_(ref)*N_(f,ref)), Δf_(ref)=15*10³ Hz, and N_(f,ref)=2048.Numbers from 0 to 9 may be respectively allocated to 10 subframes withinone wireless frame. Each subframe has a length of 1 ms and may includeone or more slots according to a subcarrier spacing. More specifically,in the 3GPP NR system, the subcarrier spacing that may be used is15*2^(μ) kHz, and μ can have a value of μ=0, 1, 2, 3, 4 as subcarrierspacing configuration. That is, 15 kHz, 30 kHz, 60 kHz, 120 kHz and 240kHz may be used for subcarrier spacing. One subframe having a length of1 ms may include 2^(μ) slots. In this case, the length of each slot is2^(μ) ms. Numbers from 0 to 2^(μ)−1 may be respectively allocated to2^(μ) slots within one subframe. In addition, numbers from 0 to10*2^(μ)−1 may be respectively allocated to slots within one subframe.The time resource may be distinguished by at least one of a wirelessframe number (also referred to as a wireless frame index), a subframenumber (also referred to as a subframe number), and a slot number (or aslot index).

FIG. 2 illustrates an example of a downlink (DL)/uplink (UL) slotstructure in a wireless communication system. In particular, FIG. 2shows the structure of the resource grid of the 3GPP NR system.

There is one resource grid per antenna port. Referring to FIG. 2, a slotincludes a plurality of orthogonal frequency division multiplexing(OFDM) symbols in a time domain and includes a plurality of resourceblocks (RBs) in a frequency domain. An OFDM symbol also means one symbolsection. Unless otherwise specified, OFDM symbols may be referred tosimply as symbols. One RB includes 12 consecutive subcarriers in thefrequency domain. Referring to FIG. 2, a signal transmitted from eachslot may be represented by a resource grid including N^(size,μ)_(grid,x)*N^(RB) _(sc) subcarriers, and N^(slot) _(symb) OFDM symbols.Here, x=DL when the signal is a DL signal, and x=UL when the signal isan UL signal. N^(size,μ) _(grid,x) represents the number of resourceblocks (RBs) according to the subcarrier spacing constituent μ (x is DLor UL), and N^(slot) _(symb) represents the number of OFDM symbols in aslot. N^(RB) _(sc) is the number of subcarriers constituting one RB andN^(RB) _(sc)=12. An OFDM symbol may be referred to as a cyclic shiftOFDM (CP-OFDM) symbol or a discrete Fourier transform spread OFDM(DFT-s-OFDM) symbol according to a multiple access scheme.

The number of OFDM symbols included in one slot may vary according tothe length of a cyclic prefix (CP). For example, in the case of a normalCP, one slot includes 14 OFDM symbols, but in the case of an extendedCP, one slot may include 12 OFDM symbols. In a specific embodiment, theextended CP can only be used at 60 kHz subcarrier spacing. In FIG. 2,for convenience of description, one slot is configured with 14 OFDMsymbols by way of example, but embodiments of the present disclosure maybe applied in a similar manner to a slot having a different number ofOFDM symbols. Referring to FIG. 2, each OFDM symbol includes N^(size,μ)_(grid,x)*N^(RB) _(sc) subcarriers in the frequency domain. The type ofsubcarrier may be divided into a data subcarrier for data transmission,a reference signal subcarrier for transmission of a reference signal,and a guard band. The carrier frequency is also referred to as thecenter frequency (fc).

One RB may be defined by N^(RB) _(sc) (e.g., 12) consecutive subcarriersin the frequency domain. For reference, a resource configured with oneOFDM symbol and one subcarrier may be referred to as a resource element(RE) or a tone. Therefore, one RB can be configured with N^(slot)_(symb)*N^(RB) _(sc) resource elements. Each resource element in theresource grid can be uniquely defined by a pair of indexes (k, l) in oneslot. k may be an index assigned from 0 to N^(size,μ) _(grid,x)*N^(RB)_(sc)−1 in the frequency domain, and 1 may be an index assigned from 0to N^(slot) _(symb)−1 in the time domain.

In order for the UE to receive a signal from the base station or totransmit a signal to the base station, the time/frequency of the UE maybe synchronized with the time/frequency of the base station. This isbecause when the base station and the UE are synchronized, the UE candetermine the time and frequency parameters necessary for demodulatingthe DL signal and transmitting the UL signal at the correct time.

Each symbol of a radio frame used in a time division duplex (TDD) or anunpaired spectrum may be configured with at least one of a DL symbol, anUL symbol, and a flexible symbol. A radio frame used as a DL carrier ina frequency division duplex (FDD) or a paired spectrum may be configuredwith a DL symbol or a flexible symbol, and a radio frame used as a ULcarrier may be configured with a UL symbol or a flexible symbol. In theDL symbol, DL transmission is possible, but UL transmission isimpossible. In the UL symbol, UL transmission is possible, but DLtransmission is impossible. The flexible symbol may be determined to beused as a DL or an UL according to a signal.

Information on the type of each symbol, i.e., information representingany one of DL symbols, UL symbols, and flexible symbols, may beconfigured with a cell-specific or common radio resource control (RRC)signal. In addition, information on the type of each symbol mayadditionally be configured with a UE-specific or dedicated RRC signal.The base station informs, by using cell-specific RRC signals, i) theperiod of cell-specific slot configuration, ii) the number of slots withonly DL symbols from the beginning of the period of cell-specific slotconfiguration, iii) the number of DL symbols from the first symbol ofthe slot immediately following the slot with only DL symbols, iv) thenumber of slots with only UL symbols from the end of the period of cellspecific slot configuration, and v) the number of UL symbols from thelast symbol of the slot immediately before the slot with only the ULsymbol. Here, symbols not configured with any one of a UL symbol and aDL symbol are flexible symbols.

When the information on the symbol type is configured with theUE-specific RRC signal, the base station may signal whether the flexiblesymbol is a DL symbol or an UL symbol in the cell-specific RRC signal.In this case, the UE-specific RRC signal can not change a DL symbol or aUL symbol configured with the cell-specific RRC signal into anothersymbol type. The UE-specific RRC signal may signal the number of DLsymbols among the N^(slot) _(symb) symbols of the corresponding slot foreach slot, and the number of UL symbols among the N^(slot) _(symb)symbols of the corresponding slot. In this case, the DL symbol of theslot may be continuously configured with the first symbol to the i-thsymbol of the slot. In addition, the UL symbol of the slot may becontinuously configured with the j-th symbol to the last symbol of theslot (where i<j). In the slot, symbols not configured with any one of aUL symbol and a DL symbol are flexible symbols.

The type of symbol configured with the above RRC signal may be referredto as a semi-static DL/UL configuration. In the semi-static DL/ULconfiguration previously configured with RRC signals, the flexiblesymbol may be indicated by a DL symbol, an UL symbol, or a flexiblesymbol through dynamic slot format information (SFI) transmitted on aphysical DL control channel (PDCCH). In this case, the DL symbol or ULsymbol configured with the RRC signal is not changed to another symboltype. Table 1 exemplifies the dynamic SFI that the base station canindicate to the UE.

TABLE 1 Symbol number in a slot Symbol number in a slot Index 0 1 2 3 45 6 7 8 9 10 11 12 13 Index 0 1 2 3 4 5 6 7 8 9 10 11 12 13 0 D D D D DD D D D D D D D D 28 D D D D D D D D D D D D X U 1 U U U U U U U U U U UU U U 29 D D D D D D D D D D D X X U 2 X X X X X X X X X X X X X X 30 DD D D D D D D D D X X X U 3 D D D D D D D D D D D D D X 31 D D D D D D DD D D D X U U 4 D D D D D D D D D D D D X X 32 D D D D D D D D D D X X UU 5 D D D D D D D D D D D X X X 33 D D D D D D D D D X X X U U 6 D D D DD D D D D D X X X X 34 D X U U U U U U U U U U U U 7 D D D D D D D D D XX X X X 35 D D X U U U U U U U U U U U 8 X X X X X X X X X X X X X U 36D D D X U U U U U U U U U U 9 X X X X X X X X X X X X U U 37 D X X U U UU U U U U U U U 10 X U U U U U U U U U U U U U 38 D D X X U U U U U U UU U U 11 X X U U U U U U U U U U U U 39 D D D X X U U U U U U U U U 12 XX X U U U U U U U U U U U 40 D X X X U U U U U U U U U U 13 X X X X U UU U U U U U U U 41 D D X X X U U U U U U U U U 14 X X X X X U U U U U UU U U 42 D D D X X X U U U U U U U U 15 X X X X X X U U U U U U U U 43 DD D D D D D D D X X X X U 16 D X X X X X X X X X X X X X 44 D D D D D DX X X X X X U U 17 D D X X X X X X X X X X X X 45 D D D D D D X X U U UU U U 18 D D D X X X X X X X X X X X 46 D D D D D X U D D D D D X U 19 DX X X X X X X X X X X X U 47 D D X U U U U D D X U U U U 20 D D X X X XX X X X X X X U 48 D X U U U U U D X U U U U U 21 D D D X X X X X X X XX X U 49 D D D D X X U D D D D X X U 22 D X X X X X X X X X X X U U 50 DD X X U U U D D X X U U U 23 D D X X X X X X X X X X U U 51 D X X U U UU D X X U U U U 24 D D D X X X X X X X X X U U 52 D X X X X X U D X X XX X U 25 D X X X X X X X X X X U U U 53 D D X X X X U D D X X X X U 26 DD X X X X X X X X X U U U 54 X X X X X X X D D D D D D D 27 D D D X X XX X X X X U U U 55 D D X X X U U U D D D D D D 56-255 Reserved

In Table 1, D denotes a DL symbol, U denotes a UL symbol, and X denotesa flexible symbol. As shown in Table 1, up to two DL/UL switching in oneslot may be allowed.

FIG. 3 is a diagram for explaining a physical channel used in a 3GPPsystem (e.g., NR) and a typical signal transmission method using thephysical channel.

If the power of the UE is turned on or the UE camps on a new cell, theUE performs an initial cell search (S101). Specifically, the UE maysynchronize with the B S in the initial cell search. For this, the UEmay receive a primary synchronization signal (PSS) and a secondarysynchronization signal (SSS) from the base station to synchronize withthe base station, and obtain information such as a cell ID. Thereafter,the UE can receive the physical broadcast channel from the base stationand obtain the broadcast information in the cell.

Upon completion of the initial cell search, the UE receives a physicaldownlink shared channel (PDSCH) according to the physical downlinkcontrol channel (PDCCH) and information in the PDCCH, so that the UE canobtain more specific system information than the system informationobtained through the initial cell search (S102). Herein, the systeminformation received by the UE is cell-common system information fornormal operating of the UE in a physical layer in radio resource control(RRC) and is referred to remaining system information, or systeminformation block (SIB) 1 is called.

When the UE initially accesses the base station or does not have radioresources for signal transmission (i.e. the UE at RRC IDLE mode), the UEmay perform a random access procedure on the base station (operationsS103 to S106). First, the UE can transmit a preamble through a physicalrandom access channel (PRACH) (S103) and receive a response message forthe preamble from the base station through the PDCCH and thecorresponding PDSCH (S104). When a valid random access response messageis received by the UE, the UE transmits data including the identifier ofthe UE and the like to the base station through a physical uplink sharedchannel (PUSCH) indicated by the UL grant transmitted through the PDCCHfrom the base station (S105). Next, the UE waits for reception of thePDCCH as an indication of the base station for collision resolution. Ifthe UE successfully receives the PDCCH through the identifier of the UE(S106), the random access process is terminated. The UE may obtainUE-specific system information for normal operating of the UE in thephysical layer in RRC layer during a random access process. When the UEobtain the UE-specific system information, the use enter RRC connectingmode (RRC CONNECTED mode).

The RRC layer is used for generating or managing message for controllingconnection between the UE and radio access network (RAN). In moredetail, the base station and the UE, in the RRC layer, may performbroadcasting cell system information required by every UE in the cell,managing mobility and handover, measurement report of the UE, storagemanagement including UE capability management and device management. Ingeneral, the RRC signal is not changed and maintained quite longinterval since a period of an update of a signal delivered in the RRClayer is longer than a transmission time interval (TTI) in physicallayer.

After the above-described procedure, the UE receives PDCCH/PDSCH (S107)and transmits a physical uplink shared channel (PUSCH)/physical uplinkcontrol channel (PUCCH) (S108) as a general UL/DL signal transmissionprocedure. In particular, the UE may receive downlink controlinformation (DCI) through the PDCCH. The DCI may include controlinformation such as resource allocation information for the UE. Also,the format of the DCI may vary depending on the intended use. The uplinkcontrol information (UCI) that the UE transmits to the base stationthrough UL includes a DL/UL ACK/NACK signal, a channel quality indicator(CQI), a precoding matrix index (PMI), a rank indicator (RI), and thelike. Here, the CQI, PMI, and RI may be included in channel stateinformation (CSI). In the 3GPP NR system, the UE may transmit controlinformation such as HARQ-ACK and CSI described above through the PUSCHand/or PUCCH.

FIG. 4 illustrates an SS/PBCH block for initial cell access in a 3GPP NRsystem. When the power is turned on or wanting to access a new cell, theUE may obtain time and frequency synchronization with the cell andperform an initial cell search procedure. The UE may detect a physicalcell identity N^(cell) _(ID) of the cell during a cell search procedure.For this, the UE may receive a synchronization signal, for example, aprimary synchronization signal (PSS) and a secondary synchronizationsignal (SSS), from a base station, and synchronize with the basestation. In this case, the UE can obtain information such as a cellidentity (ID).

Referring to FIG. 4A, a synchronization signal (SS) will be described inmore detail. The synchronization signal can be classified into PSS andSSS. The PSS may be used to obtain time domain synchronization and/orfrequency domain synchronization, such as OFDM symbol synchronizationand slot synchronization. The SSS can be used to obtain framesynchronization and cell group ID. Referring to FIG. 4A and Table 2, theSS/PBCH block can be configured with consecutive 20 RBs (=240subcarriers) in the frequency axis, and can be configured withconsecutive 4 OFDM symbols in the time axis. In this case, in theSS/PBCH block, the PSS is transmitted in the first OFDM symbol and theSSS is transmitted in the third OFDM symbol through the 56th to 182thsubcarriers. Here, the lowest subcarrier index of the SS/PBCH block isnumbered from 0. In the first OFDM symbol in which the PSS istransmitted, the base station does not transmit a signal through theremaining subcarriers, i.e., 0th to 55th and 183th to 239th subcarriers.In addition, in the third OFDM symbol in which the SSS is transmitted,the base station does not transmit a signal through 48th to 55th and183th to 191th subcarriers. The base station transmits a physicalbroadcast channel (PBCH) through the remaining RE except for the abovesignal in the SS/PBCH block.

TABLE 2 OFDM symbol number l Subcarrier number k Channel relative to thestart relative to the start or signal of an SS/PBCH block of an SS/PBCHblock PSS 0 56, 57, . . . , 182 SSS 2 56, 57, . . . , 182 Set to 0 0 0,1, . . . , 55, 183, 184, . . . , 239 2 48, 49, . . . , 55, 183, 184, . .. , 191 PBCH 1, 3 0, 1, . . . , 239 2 0, 1, . . . , 47, 192, 193, . . ., 239 DM-RS for 1, 3 0 + v, 4 + v, 8 + PBCH v, . . . , 236 + v 2 0 + v,4 + v, 8 + v, . . . , 44 + v 192 + v, 196 + v, . . . , 236 + v

The SS allows a total of 1008 unique physical layer cell IDs to begrouped into 336 physical-layer cell-identifier groups, each groupincluding three unique identifiers, through a combination of three PSSsand SSSs, specifically, such that each physical layer cell ID is to beonly a part of one physical-layer cell-identifier group. Therefore, thephysical layer cell ID N^(cell) _(ID)=3N⁽¹⁾ _(ID)+N⁽²⁾ _(ID) can beuniquely defined by the index N⁽¹⁾ _(ID) ranging from 0 to 335indicating a physical-layer cell-identifier group and the index N⁽²⁾_(ID) ranging from 0 to 2 indicating a physical-layer identifier in thephysical-layer cell-identifier group. The UE may detect the PSS andidentify one of the three unique physical-layer identifiers. Inaddition, the UE can detect the SSS and identify one of the 336 physicallayer cell IDs associated with the physical-layer identifier. In thiscase, the sequence d_(PSS)(n) of the PSS is as follows.

d _(PSS)(n)=1−2x(m)

m=(n+43N _(ID) ⁽²⁾)mod 127

0≤n<127

Here, x(i+7)=(x(i+4)+x(i))mod 2 and is given as[x(6) x(5) x(4) x(3) x(2) x(1) x(0)]=[1 1 1 0 1 1 0]Further, the sequence d_(SSS)(n) of the SSS is as follows.

d_(SSS)(n) = [1 − 2x₀((n + m₀)mod127)][1 − 2x₁((n + m₁)mod127)]$m_{0} = {{15\left\lfloor \frac{N_{ID}^{(1)}}{112} \right\rfloor} + {5N_{ID}^{(2)}}}$m₁ = N_(ID)⁽¹⁾mod112 0 ≤ n < 127 ${Here},\begin{matrix}{{x_{0}\left( {i + 7} \right)} = {\left( {{x_{0}\left( {i + 4} \right)} + {x_{0}(i)}} \right){{mod}2}}} \\{{x_{1}\left( {i + 7} \right)} = {\left( {{x_{1}\left( {i + 1} \right)} + {x_{1}(i)}} \right){{mod}2}}}\end{matrix}$

and is given as[x₀(6) x₀(5) x₀(4) x₀(3) x₀(2) x₀(1) x₀(0)]=[0 0 0 0 0 0 1][x₁(6) x₁(5) x₁(4) x₁(3) x₁(2) x₁(1) x₁(0)]=[0 0 0 0 0 0 1]

A radio frame with a 10 ms length may be divided into two half frameswith a 5 ms length. Referring to FIG. 4B, a description will be made ofa slot in which SS/PBCH blocks are transmitted in each half frame. Aslot in which the SS/PBCH block is transmitted may be any one of thecases A, B, C, D, and E. In the case A, the subcarrier spacing is 15 kHzand the starting time point of the SS/PBCH block is the ({2, 8}+14*n)-thsymbol. In this case, n=0 or 1 at a carrier frequency of 3 GHz or less.In addition, it may be n=0, 1, 2, 3 at carrier frequencies above 3 GHzand below 6 GHz. In the case B, the subcarrier spacing is 30 kHz and thestarting time point of the SS/PBCH block is {4, 8, 16, 20}+28*n. In thiscase, n=0 at a carrier frequency of 3 GHz or less. In addition, it maybe n=0, 1 at carrier frequencies above 3 GHz and below 6 GHz. In thecase C, the subcarrier spacing is 30 kHz and the starting time point ofthe SS/PBCH block is the ({2, 8}+14*n)-th symbol. In this case, n=0 or 1at a carrier frequency of 3 GHz or less. In addition, it may be n=0, 1,2, 3 at carrier frequencies above 3 GHz and below 6 GHz. In the case D,the subcarrier spacing is 120 kHz and the starting time point of theSS/PBCH block is the ({4, 8, 16, 20}+28*n)-th symbol. In this case, at acarrier frequency of 6 GHz or more, n=0, 1, 2, 3, 5, 6, 7, 8, 10, 11,12, 13, 15, 16, 17, 18. In the case E, the subcarrier spacing is 240 kHzand the starting time point of the SS/PBCH block is the ({8, 12, 16, 20,32, 36, 40, 44}+56*n)-th symbol. In this case, at a carrier frequency of6 GHz or more, n=0, 1, 2, 3, 5, 6, 7, 8.

FIG. 5 illustrates a procedure for transmitting control information anda control channel in a 3GPP NR system. Referring to FIG. 5A, the basestation may add a cyclic redundancy check (CRC) masked (e.g., an XORoperation) with a radio network temporary identifier (RNTI) to controlinformation (e.g., downlink control information (DCI)) (S202). The basestation may scramble the CRC with an RNTI value determined according tothe purpose/target of each control information. The common RNTI used byone or more UEs can include at least one of a system information RNTI(SI-RNTI), a paging RNTI (P-RNTI), a random access RNTI (RA-RNTI), and atransmit power control RNTI (TPC-RNTI). In addition, the UE-specificRNTI may include at least one of a cell temporary RNTI (C-RNTI), and theCS-RNTI. Thereafter, the base station may perform rate-matching (S206)according to the amount of resource(s) used for PDCCH transmission afterperforming channel encoding (e.g., polar coding) (S204). Thereafter, thebase station may multiplex the DCI(s) based on the control channelelement (CCE) based PDCCH structure (S208). In addition, the basestation may apply an additional process (S210) such as scrambling,modulation (e.g., QPSK), interleaving, and the like to the multiplexedDCI(s), and then map the DCI(s) to the resource to be transmitted. TheCCE is a basic resource unit for the PDCCH, and one CCE may include aplurality (e.g., six) of resource element groups (REGs). One REG may beconfigured with a plurality (e.g., 12) of REs. The number of CCEs usedfor one PDCCH may be defined as an aggregation level. In the 3GPP NRsystem, an aggregation level of 1, 2, 4, 8, or 16 may be used. FIG. 5Bis a diagram related to a CCE aggregation level and the multiplexing ofa PDCCH and illustrates the type of a CCE aggregation level used for onePDCCH and CCE(s) transmitted in the control area according thereto.

FIG. 6 illustrates a control resource set (CORESET) in which a physicaldownlink control channel (PUCCH) may be transmitted in a 3GPP NR system.

The CORESET is a time-frequency resource in which PDCCH, that is, acontrol signal for the UE, is transmitted. In addition, a search spaceto be described later may be mapped to one CORESET. Therefore, the UEmay monitor the time-frequency domain designated as CORESET instead ofmonitoring all frequency bands for PDCCH reception, and decode the PDCCHmapped to CORESET. The base station may configure one or more CORESETsfor each cell to the UE. The CORESET may be configured with up to threeconsecutive symbols on the time axis. In addition, the CORESET may beconfigured in units of six consecutive PRBs on the frequency axis. Inthe embodiment of FIG. 5, CORESET #1 is configured with consecutivePRBs, and CORESET #2 and CORESET #3 are configured with discontinuousPRBs. The CORESET can be located in any symbol in the slot. For example,in the embodiment of FIG. 5, CORESET #1 starts at the first symbol ofthe slot, CORESET #2 starts at the fifth symbol of the slot, and CORESET#9 starts at the ninth symbol of the slot.

FIG. 7 illustrates a method for setting a PUCCH search space in a 3GPPNR system. In order to transmit the PDCCH to the UE, each CORESET mayhave at least one search space. In the embodiment of the presentdisclosure, the search space is a set of all time-frequency resources(hereinafter, PDCCH candidates) through which the PDCCH of the UE iscapable of being transmitted. The search space may include a commonsearch space that the UE of the 3GPP NR is required to commonly searchand a Terminal-specific or a UE-specific search space that a specific UEis required to search. In the common search space, UE may monitor thePDCCH that is set so that all UEs in the cell belonging to the same basestation commonly search. In addition, the UE-specific search space maybe set for each UE so that UEs monitor the PDCCH allocated to each UE atdifferent search space position according to the UE. In the case of theUE-specific search space, the search space between the UEs may bepartially overlapped and allocated due to the limited control area inwhich the PDCCH may be allocated. Monitoring the PDCCH includes blinddecoding for PDCCH candidates in the search space. When the blinddecoding is successful, it may be expressed that the PDCCH is(successfully) detected/received and when the blind decoding fails, itmay be expressed that the PDCCH is not detected/not received, or is notsuccessfully detected/received.

For convenience of explanation, a PDCCH scrambled with a group common(GC) RNTI previously known to one or more UEs so as to transmit DLcontrol information to the one or more UEs is referred to as a groupcommon (GC) PDCCH or a common PDCCH. In addition, a PDCCH scrambled witha specific-terminal RNTI that a specific UE already knows so as totransmit UL scheduling information or DL scheduling information to thespecific UE is referred to as a specific-UE PDCCH. The common PDCCH maybe included in a common search space, and the UE-specific PDCCH may beincluded in a common search space or a UE-specific PDCCH.

The base station may signal each UE or UE group through a PDCCH aboutinformation (i.e., DL Grant) related to resource allocation of a pagingchannel (PCH) and a downlink-shared channel (DL-SCH) that are atransmission channel or information (i.e., UL grant) related to resourceallocation of a uplink-shared channel (UL-SCH) and a hybrid automaticrepeat request (HARQ). The base station may transmit the PCH transportblock and the DL-SCH transport block through the PDSCH. The base stationmay transmit data excluding specific control information or specificservice data through the PDSCH. In addition, the UE may receive dataexcluding specific control information or specific service data throughthe PDSCH.

The base station may include, in the PDCCH, information on to which UE(one or a plurality of UEs) PDSCH data is transmitted and how the PDSCHdata is to be received and decoded by the corresponding UE, and transmitthe PDCCH. For example, it is assumed that the DCI transmitted on aspecific PDCCH is CRC masked with an RNTI of “A”, and the DCI indicatesthat PDSCH is allocated to a radio resource (e.g., frequency location)of “B” and indicates transmission format information (e.g., transportblock size, modulation scheme, coding information, etc.) of “C”. The UEmonitors the PDCCH using the RNTI information that the UE has. In thiscase, if there is a UE which performs blind decoding the PDCCH using the“A” RNTI, the UE receives the PDCCH, and receives the PDSCH indicated by“B” and “C” through the received PDCCH information.

Table 3 shows an embodiment of a physical uplink control channel (PUCCH)used in a wireless communication system.

TABLE 3 PUCCH Length in Number of format OFDM symbols bits 0 1-2  ≤2 14-14 ≤2 2 1-2  >2 3 4-14 >2 4 4-14 >2

The PUCCH may be used to transmit the following UL control information(UCI).

-   -   Scheduling Request (SR): Information used for requesting a UL        UL-SCH resource.    -   HARQ-ACK: A Response to PDCCH (indicating DL SPS release) and/or        a response to DL transport block (TB) on PDSCH. HARQ-ACK        indicates whether information transmitted on the PDCCH or PDSCH        is received. The HARQ-ACK response includes positive ACK (simply        ACK), negative ACK (hereinafter NACK), Discontinuous        Transmission (DTX), or NACK/DTX. Here, the term HARQ-ACK is used        mixed with HARQ-ACK/NACK and ACK/NACK. In general, ACK may be        represented by bit value 1 and NACK may be represented by bit        value 0.    -   Channel State Information (CSI): Feedback information on the DL        channel. The UE generates it based on the CSI-Reference Signal        (RS) transmitted by the base station. Multiple Input Multiple        Output (MIMO)-related feedback information includes a Rank        Indicator (RI) and a Precoding Matrix Indicator (PMI). CSI can        be divided into CSI part 1 and CSI part 2 according to the        information indicated by CSI.

In the 3GPP NR system, five PUCCH formats may be used to support variousservice scenarios, various channel environments, and frame structures.

PUCCH format 0 is a format capable of delivering 1-bit or 2-bit HARQ-ACKinformation or SR. PUCCH format 0 can be transmitted through one or twoOFDM symbols on the time axis and one PRB on the frequency axis. WhenPUCCH format 0 is transmitted in two OFDM symbols, the same sequence onthe two symbols may be transmitted through different RBs. In this case,the sequence may be a sequence cyclic shifted (CS) from a base sequenceused in PUCCH format 0. Through this, the UE may obtain a frequencydiversity gain. In more detail, the UE may determine a cyclic shift (CS)value m_(cs) according to M_(bit) bit UCI (M_(bit)=1 or 2). In addition,the base sequence having the length of 12 may be transmitted by mappinga cyclic shifted sequence based on a predetermined CS value m_(cs) toone OFDM symbol and 12 REs of one RB. When the number of cyclic shiftsavailable to the UE is 12 and M_(bit)=1, 1 bit UCI 0 and 1 may be mappedto two cyclic shifted sequences having a difference of 6 in the cyclicshift value, respectively. In addition, when M_(bit)=2, 2 bit UCI 00,01, 11, and 10 may be mapped to four cyclic shifted sequences having adifference of 3 in cyclic shift values, respectively.

PUCCH format 1 may deliver 1-bit or 2-bit HARQ-ACK information or SR.PUCCH format 1 maybe transmitted through consecutive OFDM symbols on thetime axis and one PRB on the frequency axis. Here, the number of OFDMsymbols occupied by PUCCH format 1 may be one of 4 to 14. Morespecifically, UCI, which is M_(bit)=1, may be BPSK-modulated. The UE maymodulate UCI, which is M_(bit)=2, with quadrature phase shift keying(QPSK). A signal is obtained by multiplying a modulated complex valuedsymbol d(0) by a sequence of length 12. In this case, the sequence maybe a base sequence used for PUCCH format 0. The UE spreads theeven-numbered OFDM symbols to which PUCCH format 1 is allocated throughthe time axis orthogonal cover code (OCC) to transmit the obtainedsignal. PUCCH format 1 determines the maximum number of different UEsmultiplexed in the one RB according to the length of the OCC to be used.A demodulation reference signal (DMRS) may be spread with OCC and mappedto the odd-numbered OFDM symbols of PUCCH format 1.

PUCCH format 2 may deliver UCI exceeding 2 bits. PUCCH format 2 may betransmitted through one or two OFDM symbols on the time axis and one ora plurality of RBs on the frequency axis. When PUCCH format 2 istransmitted in two OFDM symbols, the sequences which are transmitted indifferent RBs through the two OFDM symbols may be same each other. Here,the sequence may be a plurality of modulated complex valued symbolsd(0), . . . , d(M_(symbol)−1). Here, M_(symbol) may be M_(bit)/2.Through this, the UE may obtain a frequency diversity gain. Morespecifically, M_(bit) bit UCI (M_(bit)>2) is bit-level scrambled, QPSKmodulated, and mapped to RB(s) of one or two OFDM symbol(s). Here, thenumber of RBs may be one of 1 to 16.

PUCCH format 3 or PUCCH format 4 may deliver UCI exceeding 2 bits. PUCCHformat 3 or PUCCH format 4 may be transmitted through consecutive OFDMsymbols on the time axis and one PRB on the frequency axis. The numberof OFDM symbols occupied by PUCCH format 3 or PUCCH format 4 may be oneof 4 to 14. Specifically, the UE modulates M_(bit) bits UCI (Mbit>2)with π/2-Binary Phase Shift Keying (BPSK) or QPSK to generate a complexvalued symbol d(0) to d(M_(symb)−1). Here, when using π/2-BPSK,M_(symb)=M_(bit), and when using QPSK, M_(symb)=M_(bit)/2. The UE maynot apply block-unit spreading to the PUCCH format 3. However, the UEmay apply block-unit spreading to one RB (i.e., 12 subcarriers) usingPreDFT-OCC of a length of 12 such that PUCCH format 4 may have two orfour multiplexing capacities. The UE performs transmit precoding (orDFT-precoding) on the spread signal and maps it to each RE to transmitthe spread signal.

In this case, the number of RBs occupied by PUCCH format 2, PUCCH format3, or PUCCH format 4 may be determined according to the length andmaximum code rate of the UCI transmitted by the UE. When the UE usesPUCCH format 2, the UE may transmit HARQ-ACK information and CSIinformation together through the PUCCH. When the number of RBs that theUE may transmit is greater than the maximum number of RBs that PUCCHformat 2, or PUCCH format 3, or PUCCH format 4 may use, the UE maytransmit only the remaining UCI information without transmitting someUCI information according to the priority of the UCI information.

PUCCH format 1, PUCCH format 3, or PUCCH format 4 may be configuredthrough the RRC signal to indicate frequency hopping in a slot. Whenfrequency hopping is configured, the index of the RB to be frequencyhopped may be configured with an RRC signal. When PUCCH format 1, PUCCHformat 3, or PUCCH format 4 is transmitted through N OFDM symbols on thetime axis, the first hop may have floor (N/2) OFDM symbols and thesecond hop may have ceiling(N/2) OFDM symbols.

PUCCH format 1, PUCCH format 3, or PUCCH format 4 may be configured tobe repeatedly transmitted in a plurality of slots. In this case, thenumber K of slots in which the PUCCH is repeatedly transmitted may beconfigured by the RRC signal. The repeatedly transmitted PUCCHs muststart at an OFDM symbol of the constant position in each slot, and havethe constant length. When one OFDM symbol among OFDM symbols of a slotin which a UE should transmit a PUCCH is indicated as a DL symbol by anRRC signal, the UE may not transmit the PUCCH in a corresponding slotand delay the transmission of the PUCCH to the next slot to transmit thePUCCH.

Meanwhile, in the 3GPP NR system, a UE may performtransmission/reception using a bandwidth equal to or less than thebandwidth of a carrier (or cell). For this, the UE may receive theBandwidth part (BWP) configured with a continuous bandwidth of some ofthe carrier's bandwidth. A UE operating according to TDD or operating inan unpaired spectrum can receive up to four DL/UL BWP pairs in onecarrier (or cell). In addition, the UE may activate one DL/UL BWP pair.A UE operating according to FDD or operating in paired spectrum canreceive up to four DL BWPs on a DL carrier (or cell) and up to four ULBWPs on a UL carrier (or cell). The UE may activate one DL BWP and oneUL BWP for each carrier (or cell). The UE may not perform reception ortransmission in a time-frequency resource other than the activated BWP.The activated BWP may be referred to as an active BWP.

The base station may indicate the activated BWP among the BWPsconfigured by the UE through downlink control information (DCI). The BWPindicated through the DCI is activated and the other configured BWP(s)are deactivated. In a carrier (or cell) operating in TDD, the basestation may include, in the DCI for scheduling PDSCH or PUSCH, abandwidth part indicator (BPI) indicating the BWP to be activated tochange the DL/UL BWP pair of the UE. The UE may receive the DCI forscheduling the PDSCH or PUSCH and may identify the DL/UL BWP pairactivated based on the BPI. For a DL carrier (or cell) operating in anFDD, the base station may include a BPI indicating the BWP to beactivated in the DCI for scheduling PDSCH so as to change the DL BWP ofthe UE. For a UL carrier (or cell) operating in an FDD, the base stationmay include a BPI indicating the BWP to be activated in the DCI forscheduling PUSCH so as to change the UL BWP of the UE.

FIG. 8 is a conceptual diagram illustrating carrier aggregation.

The carrier aggregation is a method in which the UE uses a plurality offrequency blocks or cells (in the logical sense) configured with ULresources (or component carriers) and/or DL resources (or componentcarriers) as one large logical frequency band in order for a wirelesscommunication system to use a wider frequency band. One componentcarrier may also be referred to as a term called a Primary cell (PCell)or a Secondary cell (SCell), or a Primary SCell (PScell). However,hereinafter, for convenience of description, the term “componentcarrier” is used.

Referring to FIG. 8, as an example of a 3GPP NR system, the entiresystem band may include up to 16 component carriers, and each componentcarrier may have a bandwidth of up to 400 MHz. The component carrier mayinclude one or more physically consecutive subcarriers. Although it isshown in FIG. 8 that each of the component carriers has the samebandwidth, this is merely an example, and each component carrier mayhave a different bandwidth. Also, although each component carrier isshown as being adjacent to each other in the frequency axis, thedrawings are shown in a logical concept, and each component carrier maybe physically adjacent to one another, or may be spaced apart.

Different center frequencies may be used for each component carrier.Also, one common center frequency may be used in physically adjacentcomponent carriers. Assuming that all the component carriers arephysically adjacent in the embodiment of FIG. 8, center frequency A maybe used in all the component carriers. Further, assuming that therespective component carriers are not physically adjacent to each other,center frequency A and the center frequency B can be used in each of thecomponent carriers.

When the total system band is extended by carrier aggregation, thefrequency band used for communication with each UE can be defined inunits of a component carrier. UE A may use 100 MHz, which is the totalsystem band, and performs communication using all five componentcarriers. UEs B₁˜B₅ can use only a 20 MHz bandwidth and performcommunication using one component carrier. UEs C₁ and C₂ may use a 40MHz bandwidth and perform communication using two component carriers,respectively. The two component carriers may be logically/physicallyadjacent or non-adjacent. UE C₁ represents the case of using twonon-adjacent component carriers, and UE C₂ represents the case of usingtwo adjacent component carriers.

FIG. 9 is a drawing for explaining signal carrier communication andmultiple carrier communication. Particularly, FIG. 9A shows a singlecarrier subframe structure and FIG. 9B shows a multi-carrier subframestructure.

Referring to FIG. 9A, in an FDD mode, a general wireless communicationsystem may perform data transmission or reception through one DL bandand one UL band corresponding thereto. In another specific embodiment,in a TDD mode, the wireless communication system may divide a radioframe into a UL time unit and a DL time unit in a time domain, andperform data transmission or reception through a UL/DL time unit.Referring to FIG. 9B, three 20 MHz component carriers (CCs) can beaggregated into each of UL and DL, so that a bandwidth of 60 MHz can besupported. Each CC may be adjacent or non-adjacent to one another in thefrequency domain. FIG. 9B shows a case where the bandwidth of the UL CCand the bandwidth of the DL CC are the same and symmetric, but thebandwidth of each CC can be determined independently. In addition,asymmetric carrier aggregation with different number of UL CCs and DLCCs is possible. A DL/UL CC allocated/configured to a specific UEthrough RRC may be called as a serving DL/UL CC of the specific UE.

The base station may perform communication with the UE by activatingsome or all of the serving CCs of the UE or deactivating some CCs. Thebase station can change the CC to be activated/deactivated, and changethe number of CCs to be activated/deactivated. If the base stationallocates a CC available for the UE as to be cell-specific orUE-specific, at least one of the allocated CCs can be deactivated,unless the CC allocation for the UE is completely reconfigured or the UEis handed over. One CC that is not deactivated by the UE is called as aPrimary CC (PCC) or a primary cell (PCell), and a CC that the basestation can freely activate/deactivate is called as a Secondary CC (SCC)or a secondary cell (SCell).

Meanwhile, 3GPP NR uses the concept of a cell to manage radio resources.A cell is defined as a combination of DL resources and UL resources,that is, a combination of DL CC and UL CC. A cell may be configured withDL resources alone, or a combination of DL resources and UL resources.When the carrier aggregation is supported, the linkage between thecarrier frequency of the DL resource (or DL CC) and the carrierfrequency of the UL resource (or UL CC) may be indicated by systeminformation. The carrier frequency refers to the center frequency ofeach cell or CC. A cell corresponding to the PCC is referred to as aPCell, and a cell corresponding to the SCC is referred to as an SCell.The carrier corresponding to the PCell in the DL is the DL PCC, and thecarrier corresponding to the PCell in the UL is the UL PCC. Similarly,the carrier corresponding to the SCell in the DL is the DL SCC and thecarrier corresponding to the SCell in the UL is the UL SCC. According toUE capability, the serving cell(s) may be configured with one PCell andzero or more SCells. In the case of UEs that are in the RRC CONNECTEDstate but not configured for carrier aggregation or that do not supportcarrier aggregation, there is only one serving cell configured only withPCell.

As mentioned above, the term “cell” used in carrier aggregation isdistinguished from the term “cell” which refers to a certaingeographical area in which a communication service is provided by onebase station or one antenna group. That is, one component carrier mayalso be referred to as a scheduling cell, a scheduled cell, a primarycell (PCell), a secondary cell (SCell), or a primary SCell (PScell).However, in order to distinguish between a cell referring to a certaingeographical area and a cell of carrier aggregation, in the presentdisclosure, a cell of a carrier aggregation is referred to as a CC, anda cell of a geographical area is referred to as a cell.

FIG. 10 is a diagram showing an example in which a cross carrierscheduling technique is applied. When cross carrier scheduling is set,the control channel transmitted through the first CC may schedule a datachannel transmitted through the first CC or the second CC using acarrier indicator field (CIF). The CIF is included in the DCI. In otherwords, a scheduling cell is set, and the DL grant/UL grant transmittedin the PDCCH area of the scheduling cell schedules the PDSCH/PUSCH ofthe scheduled cell. That is, a search area for the plurality ofcomponent carriers exists in the PDCCH area of the scheduling cell. APCell may be basically a scheduling cell, and a specific SCell may bedesignated as a scheduling cell by an upper layer.

In the embodiment of FIG. 10, it is assumed that three DL CCs aremerged. Here, it is assumed that DL component carrier #0 is DL PCC (orPCell), and DL component carrier #1 and DL component carrier #2 are DLSCCs (or SCell). In addition, it is assumed that the DL PCC is set tothe PDCCH monitoring CC. When cross-carrier scheduling is not configuredby UE-specific (or UE-group-specific or cell-specific) higher layersignaling, a CIF is disabled, and each DL CC can transmit only a PDCCHfor scheduling its PDSCH without the CIF according to an NR PDCCH rule(non-cross-carrier scheduling, self-carrier scheduling). Meanwhile, ifcross-carrier scheduling is configured by UE-specific (orUE-group-specific or cell-specific) higher layer signaling, a CIF isenabled, and a specific CC (e.g., DL PCC) may transmit not only thePDCCH for scheduling the PDSCH of the DL CC A using the CIF but also thePDCCH for scheduling the PDSCH of another CC (cross-carrier scheduling).On the other hand, a PDCCH is not transmitted in another DL CC.Accordingly, the UE monitors the PDCCH not including the CIF to receivea self-carrier scheduled PDSCH depending on whether the cross-carrierscheduling is configured for the UE, or monitors the PDCCH including theCIF to receive the cross-carrier scheduled PDSCH.

On the other hand, FIGS. 9 and 10 illustrate the subframe structure ofthe 3GPP LTE-A system, and the same or similar configuration may beapplied to the 3GPP NR system. However, in the 3GPP NR system, thesubframes of FIGS. 9 and 10 may be replaced with slots.

FIG. 11 is a block diagram showing the configurations of a UE and a basestation according to an embodiment of the present disclosure. In anembodiment of the present disclosure, the UE may be implemented withvarious types of wireless communication devices or computing devicesthat are guaranteed to be portable and mobile. The UE may be referred toas a User Equipment (UE), a Station (STA), a Mobile Subscriber (MS), orthe like. In addition, in an embodiment of the present disclosure, thebase station controls and manages a cell (e.g., a macro cell, a femtocell, a pico cell, etc.) corresponding to a service area, and performsfunctions of a signal transmission, a channel designation, a channelmonitoring, a self diagnosis, a relay, or the like. The base station maybe referred to as next Generation NodeB (gNB) or Access Point (AP).

As shown in the drawing, a UE 100 according to an embodiment of thepresent disclosure may include a processor 110, a communication module120, a memory 130, a user interface 140, and a display unit 150.

First, the processor 110 may execute various instructions or programsand process data within the UE 100. In addition, the processor 110 maycontrol the entire operation including each unit of the UE 100, and maycontrol the transmission/reception of data between the units. Here, theprocessor 110 may be configured to perform an operation according to theembodiments described in the present disclosure. For example, theprocessor 110 may receive slot configuration information, determine aslot configuration based on the slot configuration information, andperform communication according to the determined slot configuration.

Next, the communication module 120 may be an integrated module thatperforms wireless communication using a wireless communication networkand a wireless LAN access using a wireless LAN. For this, thecommunication module 120 may include a plurality of network interfacecards (NICs) such as cellular communication interface cards 121 and 122and an unlicensed band communication interface card 123 in an internalor external form. In the drawing, the communication module 120 is shownas an integral integration module, but unlike the drawing, each networkinterface card can be independently arranged according to a circuitconfiguration or usage.

The cellular communication interface card 121 may transmit or receive aradio signal with at least one of the base station 200, an externaldevice, and a server by using a mobile communication network and providea cellular communication service in a first frequency band based on theinstructions from the processor 110. According to an embodiment, thecellular communication interface card 121 may include at least one NICmodule using a frequency band of less than 6 GHz. At least one NICmodule of the cellular communication interface card 121 mayindependently perform cellular communication with at least one of thebase station 200, an external device, and a server in accordance withcellular communication standards or protocols in the frequency bandsbelow 6 GHz supported by the corresponding NIC module.

The cellular communication interface card 122 may transmit or receive aradio signal with at least one of the base station 200, an externaldevice, and a server by using a mobile communication network and providea cellular communication service in a second frequency band based on theinstructions from the processor 110. According to an embodiment, thecellular communication interface card 122 may include at least one NICmodule using a frequency band of more than 6 GHz. At least one NICmodule of the cellular communication interface card 122 mayindependently perform cellular communication with at least one of thebase station 200, an external device, and a server in accordance withcellular communication standards or protocols in the frequency bands of6 GHz or more supported by the corresponding NIC module.

The unlicensed band communication interface card 123 transmits orreceives a radio signal with at least one of the base station 200, anexternal device, and a server by using a third frequency band which isan unlicensed band, and provides an unlicensed band communicationservice based on the instructions from the processor 110. The unlicensedband communication interface card 123 may include at least one NICmodule using an unlicensed band. For example, the unlicensed band may bea band of 2.4 GHz or 5 GHz. At least one NIC module of the unlicensedband communication interface card 123 may independently or dependentlyperform wireless communication with at least one of the base station200, an external device, and a server according to the unlicensed bandcommunication standard or protocol of the frequency band supported bythe corresponding NIC module.

The memory 130 stores a control program used in the UE 100 and variouskinds of data therefor. Such a control program may include a prescribedprogram required for performing wireless communication with at least oneamong the base station 200, an external device, and a server.

Next, the user interface 140 includes various kinds of input/outputmeans provided in the UE 100. In other words, the user interface 140 mayreceive a user input using various input means, and the processor 110may control the UE 100 based on the received user input. In addition,the user interface 140 may perform an output based on instructions fromthe processor 110 using various kinds of output means.

Next, the display unit 150 outputs various images on a display screen.The display unit 150 may output various display objects such as contentexecuted by the processor 110 or a user interface based on controlinstructions from the processor 110.

In addition, the base station 200 according to an embodiment of thepresent disclosure may include a processor 210, a communication module220, and a memory 230.

First, the processor 210 may execute various instructions or programs,and process internal data of the base station 200. In addition, theprocessor 210 may control the entire operations of units in the basestation 200, and control data transmission and reception between theunits. Here, the processor 210 may be configured to perform operationsaccording to embodiments described in the present disclosure. Forexample, the processor 210 may signal slot configuration and performcommunication according to the signaled slot configuration.

Next, the communication module 220 may be an integrated module thatperforms wireless communication using a wireless communication networkand a wireless LAN access using a wireless LAN. For this, thecommunication module 120 may include a plurality of network interfacecards such as cellular communication interface cards 221 and 222 and anunlicensed band communication interface card 223 in an internal orexternal form. In the drawing, the communication module 220 is shown asan integral integration module, but unlike the drawing, each networkinterface card can be independently arranged according to a circuitconfiguration or usage.

The cellular communication interface card 221 may transmit or receive aradio signal with at least one of the base station 100, an externaldevice, and a server by using a mobile communication network and providea cellular communication service in the first frequency band based onthe instructions from the processor 210. According to an embodiment, thecellular communication interface card 221 may include at least one NICmodule using a frequency band of less than 6 GHz. The at least one NICmodule of the cellular communication interface card 221 mayindependently perform cellular communication with at least one of thebase station 100, an external device, and a server in accordance withthe cellular communication standards or protocols in the frequency bandsless than 6 GHz supported by the corresponding NIC module.

The cellular communication interface card 222 may transmit or receive aradio signal with at least one of the base station 100, an externaldevice, and a server by using a mobile communication network and providea cellular communication service in the second frequency band based onthe instructions from the processor 210. According to an embodiment, thecellular communication interface card 222 may include at least one NICmodule using a frequency band of 6 GHz or more. The at least one NICmodule of the cellular communication interface card 222 mayindependently perform cellular communication with at least one of thebase station 100, an external device, and a server in accordance withthe cellular communication standards or protocols in the frequency bands6 GHz or more supported by the corresponding NIC module.

The unlicensed band communication interface card 223 transmits orreceives a radio signal with at least one of the base station 100, anexternal device, and a server by using the third frequency band which isan unlicensed band, and provides an unlicensed band communicationservice based on the instructions from the processor 210. The unlicensedband communication interface card 223 may include at least one NICmodule using an unlicensed band. For example, the unlicensed band may bea band of 2.4 GHz or 5 GHz. At least one NIC module of the unlicensedband communication interface card 223 may independently or dependentlyperform wireless communication with at least one of the base station100, an external device, and a server according to the unlicensed bandcommunication standards or protocols of the frequency band supported bythe corresponding NIC module.

FIG. 11 is a block diagram illustrating the UE 100 and the base station200 according to an embodiment of the present disclosure, and blocksseparately shown are logically divided elements of a device.Accordingly, the aforementioned elements of the device may be mounted ina single chip or a plurality of chips according to the design of thedevice. In addition, a part of the configuration of the UE 100, forexample, a user interface 140, a display unit 150 and the like may beselectively provided in the UE 100. In addition, the user interface 140,the display unit 150 and the like may be additionally provided in thebase station 200, if necessary.

FIG. 12 illustrates a resource-set used in a wireless communicationsystem according to an embodiment of the present invention.

The base station may use a resource-set (RESET), which is a set oftime-frequency resources for indicating whether the correspondingresources can be used by the UE to receive a physical data channel. Inmore detail, the base station may use a resource-set to signaltime-frequency resources that the UE cannot use for receiving a physicaldata channel. The UE may determine a time-frequency resourcecorresponding to at least one RESET through at least an RRC signal forinitial cell access. In a specific embodiment, the base station mayindicate in which RESET the UE cannot receive the physical data channelusing the field of the DCI. For convenience of description, a field ofDCI indicating whether the RESET can be used to receive a physical datachannel is referred to as a RESET field. When rate matching is used forphysical data channel reception, the RESET field may be referred to as arate-matching indicator. In addition, when puncturing is used to receivea physical data channel, the RESET field may be referred to as apuncturing indicator. The base station may indicate one or a pluralityof RESETs using the RRC signal. In more detail, the base station mayindicate a time-frequency resource corresponding to the RESET by usingan RRC signal. In addition, the base station may indicate whether one ora plurality of RESETs cannot be used for receiving the physical datachannel using the L1 signaling or the DCI scheduling the physical datachannel. In this case, the base station may signal the length of thefield of the DCI for indicating whether one or a plurality of RESETs canbe used for physical data channel reception using the RRC signal. Inaddition, according to the RESET configuration of the base station, theRESET may include all or part of the above-described CORESET. In moredetail, the RESET may be designated in units of CORESET. For example,the RESET may be designated in a single CORESET or a plurality ofCORESET units.

The UE may receive a physical data channel based on a time-frequencyresource in which a time-frequency resource scheduled for the physicaldata channel reception of the UE overlaps a time-frequency resourcecorresponding to the RESET indicated as unavailable for the physicaldata channel reception. In this case, the time-frequency resourcescheduled for the physical data channel reception of the UE may indicatea time-frequency resource scheduled for physical data channel receptionof the UE by the DCI of the physical control channel. In more detail,the DCI scheduling the physical data channel may indicate atime-frequency resource in which the physical data channel reception isscheduled to the UE through time domain information and frequency domaininformation of a time-frequency resource in which physical data channelreception is scheduled. In this case, the time domain information mayinclude an index of a start OFDM symbol of a slot in which reception ofa physical data channel is scheduled. In addition, the DCI schedulingthe physical data channel may indicate a time-frequency resource inwhich the physical data channel reception of the UE is scheduled usingthe information indicating the frequency band in which the physical datachannel reception of the UE is scheduled. In this case, the informationindicating the frequency band in which the physical data channelreception is scheduled may be indicated in units of PRBs or PRB groups.In more detail, the UE may determine the remaining time-frequencyresource as the resource for receiving the physical data channel exceptfor the RESET indicated as unavailable for receiving the physical datachannel among the time-frequency resources scheduled for physical datachannel reception. The UE determines a time-frequency resource scheduledfor the physical data channel reception of the UE according to the DCIscheduling the physical data channel. Through this, the UE can determinea time-frequency resource in which the time-frequency resourcecorresponding to the RESET configured with the RRC signal overlaps thetime-frequency resource scheduled for the physical data channelreception indicated by the DCI. For convenience of description, thetime-frequency resource in which the time-frequency resourcecorresponding to the RESET configured for the UE overlaps thetime-frequency resource scheduled for the physical data channelreception, is referred to as an overlapped-resource set(overlapped-RESET). If the time-frequency resource corresponding to theRESET that can be used for physical data channel reception and thetime-frequency resource scheduled for physical data channel reception donot overlap, the UE may determine that the physical data channelreception is available in all of the time-frequency resources in whichthe physical data channel reception is scheduled. Specifically, when thetime-frequency resource corresponding to the RESET that can be used forphysical data channel reception and the time-frequency resourcescheduled for physical data channel reception overlap, the UE mayreceive the physical data channel by performing rate matching based onthe RESET field transmitted in the DCI scheduling the physical datachannel. In this case, the UE may receive a physical data channel byperforming rate matching in the time-frequency resource except for thetime-frequency resource corresponding to the RESET in which the RESETfield indicates that the physical data channel reception is unavailablein the time-frequency resource in which the physical data channel isscheduled. In another specific embodiment, when a time-frequencyresource corresponding to a RESET that cannot be used for physical datachannel reception and a time-frequency resource scheduled for physicaldata channel reception overlap, the UE may perform puncturing based onthe RESET field. In this case, the UE may receive a physical datachannel by performing puncturing on the time-frequency resourcecorresponding to the RESET in which the RESET field indicates that thephysical data channel reception is unavailable in the time-frequencyresource in which the physical data channel is scheduled. In addition,if the time-frequency resource corresponding to the RESET that cannot beused for physical data channel reception and the time-frequency resourcescheduled for physical data channel reception do not overlap, the UE maydetermine that the physical data channel reception is available in allof the time-frequency resources scheduled for the physical data channelreception regardless of the value of the RESET field.

According to the above description, a time-frequency resource may beconfigured for the UE, which may be unavailable for reception of aphysical data channel according to an RRC signal, and the UE maydetermine a time-frequency resource that cannot be actually used forreception of a physical data channel among correspondingtime-frequencies indicated by the DCI. If the base station configures atime-frequency resource that cannot be used for reception of a physicaldata channel using only the RRC signal, since the availability ofresources changes over time, even if the resource is actually availablefor reception of a physical data channel, the resource may not always beavailable. Therefore, the spectral efficiency may decrease. If the basestation indicates a time-frequency resource that should not be used forreception of a physical data channel by DCI alone, since the basestation must signal all information related to time-frequency resourcesthat are unavailable for physical data channel reception each timethrough DCI, the overhead of the physical control channel can beincreased. Accordingly, according to the embodiments of the presentinvention, the base station may increase the spectral efficiency orreduce the overhead of the physical control channel through thecombination of the DCI with the RRC signal.

In the embodiment of FIG. 12, the first RESET RESET #1 and the secondRESET RESET #2 are configured in the n-th slot by the RRC signal. In theembodiment of FIG. 12(a), a time-frequency resource scheduled for PDSCHreception of a UE by DCI overlaps a part of the first RESET RESET #1.Accordingly, the UE determines the time-frequency resource in which thePDSCH reception of the UE is scheduled by the DCI and the time-frequencyresource in which the first RESET RESET #1 is overlapped as anoverlapped-RESET. In the embodiment of FIG. 12(b), a time-frequencyresource scheduled for PDSCH reception of a UE by DCI overlaps a part ofthe first RESET RESET #1. In addition, a time-frequency resourcescheduled for PDSCH reception of a UE by DCI overlaps a part of thesecond RESET RESET #2. Accordingly, the UE determines the time-frequencyresource in which the PDSCH reception of the UE is scheduled by the DCIand the time-frequency resource in which each of the first RESET RESET#1 and the second RESET RESET #2 overlaps as an overlapped-RESET.

The UE may not determine the time-frequency resource occupied by theRESET not configured for the UE in the current slot or may determine thetime-frequency resource only through separate signaling. In addition, itmay be difficult for the UE to determine whether the RESET configuredfor the UE can receive the physical data channel in the future slot. Inaddition, it may be difficult for the UE to determine a time-frequencyresource occupied by a physical control channel dynamically allocated toa CORESET included in the RESET configured for the UE in a future slot.As a result, it may be difficult for the UE to determine atime-frequency resource for the UE to perform physical data channelreception. Accordingly, the UE may receive starting symbol informationindicating a location of an OFDM symbol at which physical data channeltransmission starts from the base station. In more detail, the UE mayreceive starting symbol information from the base station through theDCI scheduling the physical data channel. If the number of the positionsof the OFDM symbol that can be designated as the starting symbol atwhich the physical data channel transmission starts is K, the basestation can transmit the starting symbol information using bits ofceil(log 2K). In this case, ceil(x) represents the smallest integerequal to or greater than x. In this case, the starting symbol may bedesignated for each slot. Also, the UE may determine the position of theOFDM symbol at which the physical data channel transmission starts basedon the starting symbol information. For example, when the OFDM symbolthat can be designated as the starting symbol is any one of the first tofourth OFDM symbols of the slot, the base station may transmit thestarting symbol information using 2 bits of the DCI. In this case, whenthe value of 2 bits corresponding to the starting symbol information ofthe DCI is 00_(b), the UE may determine the starting symbol as the firstOFDM symbol of the slot. In addition, when the value of 2 bitscorresponding to the starting symbol information of the DCI is 01_(b),the UE may determine the starting symbol as the second OFDM symbol ofthe slot. In addition, when the value of 2 bits corresponding to thestarting symbol information of the DCI is 10_(b), the UE may determinethe starting symbol as the third OFDM symbol of the slot. In addition,when the value of 2 bits corresponding to the starting symbolinformation of the DCI is 11_(b), the UE may determine the startingsymbol as the fourth OFDM symbol of the slot. The UE may receive aphysical data channel based on the starting symbol information. In moredetail, the UE may determine a time-frequency resource to startreceiving the physical data channel based on the starting symbolinformation. A method of receiving a data channel by a UE will bedescribed with reference to FIGS. 13 to 24. In detail, a method ofdetermining a time-frequency resource in which a UE receives a physicaldata channel will be described.

FIG. 13 illustrates a time-frequency resource domain in which a PDSCH istransmitted in a wireless communication system according to anembodiment of the present invention.

The base station may determine the starting symbol information signaledto the UE based on the RESET(s) in which the physical data channeloverlaps the scheduled time-frequency resource in the slot correspondingto the starting symbol information. Specifically, the base station mayperform determination based on the latest time resource (i.e., the lastOFDM symbol of RESET(s)) among time-frequency resources corresponding toRESET(s) overlapping the time-frequency resource scheduled for thephysical data channel in the slot corresponding to the starting symbolinformation. In this case, the base station may determine the startingsymbol information of the physical data channel so as not to overlapsthe RESET unavailable for physical data channel reception configured forthe UE based on the time-frequency resource of the RESET configured forthe UE through the RRC configuration If the RESET does not overlap thetime-frequency resource corresponding to the frequency band scheduledfor the physical data channel, the base station may start physical datachannel transmission from the first OFDM symbol of the correspondingfrequency band. Specifically, if there is a frequency band in the slotin which RESET is not configured, the base station may start thephysical data channel transmission from the first OFDM symbol of thefrequency band. FIG. 12 illustrates seven OFDM symbols of an n-th slot.In the embodiment of FIG. 12, a first RESET RESET #1 and a second RESETRESET #2 are configured in an n-th slot. In the frequency domain, thetime-frequency resource scheduled for PDSCH reception of the UE overlapsthe first RESET RESET #1, but does not overlap the second RESET RESET#2. In addition, since the first RESET RESET #1 is terminated in thesecond OFDM symbol of the n-th slot, the base station can start thePDSCH transmission from the third OFDM symbol of the n-th slot. In thiscase, the base station may set the value of the field indicating thestarting symbol information of the DCI to 10b.

When at least some of the time-frequency resources scheduled for thephysical data channel reception of the UE overlap the RESET, the basestation may designate an OFDM symbol after the last OFDM symbol of thecorresponding RESET as the starting symbol. The UE may not expectreception of a physical data channel in an OFDM symbol corresponding toa RESET that is unavailable for physical data channel receptionconfigured for the UE. In addition, the UE may expect the physical datachannel reception from the OFDM symbol next to the last OFDM symbol ofthe RESET that is unavailable for physical data channel receptionconfigured for the UE. In more detail, the UE may receive the physicaldata channel from the OFDM symbol next to the last OFDM symbol of theRESET that is unavailable for physical data channel reception.

In such embodiments, even though the time-frequency resources are notused for other purposes, they may not be used for physical data channeltransmission. For maximum utilization of time-frequency resources, theUE may distinguish a frequency band overlapping a RESET that isunavailable for physical data channel reception configured for the UEamong the frequency bands in which the physical data channel receptionof the UE is scheduled from a band not overlapping a RESET that isunavailable for physical data channel reception configured for the UE,and determine the start time point of the physical data channelreception. In addition, the base station may designate the startingsymbol information based on the last OFDM symbol among the OFDM symbolscorresponding to the RESET(s) not configured for the UE. This will bedescribed with reference to FIG. 14.

FIG. 14 illustrates a time-frequency resource domain in which a PDSCH istransmitted in a wireless communication system according to anembodiment of the present invention.

As described above, the UE may distinguish a frequency band overlappinga RESET that is unavailable for physical data channel receptionconfigured for the UE among the frequency bands in which the physicaldata channel reception of the UE is scheduled from a frequency band notoverlapping a RESET configured for the UE, and determine the start timeof the physical data channel reception. In addition, the base stationmay designate the starting symbol information based on the last OFDMsymbol among the OFDM symbols corresponding to the RESET(s) notconfigured for the UE. In more detail, the base station may indicate, asa starting symbol, an OFDM symbol next to the last OFDM symbol amongOFDM symbols corresponding to RESET(s) not configured for the UE. In aspecific embodiment, in the frequency band overlapping the RESETunavailable for the physical data channel reception configured for theUE among the frequency bands in which the physical data channelreception of the UE is scheduled, the UE may expect the physical datachannel reception from the OFDM symbol next to the last OFDM symbol ofthe RESET in which the physical data channel reception configured forthe UE is unavailable. In a specific embodiment, in the frequency bandnot overlapping the RESET unavailable for the physical data channelreception configured for the UE among the frequency bands in which thephysical data channel reception is scheduled, the UE may expect thephysical data channel reception from the OFDM symbol indicated by thestarting symbol information. The reason for indicating the startingsymbol of the physical data channel is because the UE may determine aRESET that is unavailable for physical data channel reception configuredfor the UE, but may not determine a RESET configured for another UE.

FIG. 14 illustrates seven OFDM symbols of an n-th slot. In theembodiment of FIG. 14, a first RESET CORESET #1 and a second RESETCORESET #2 are configured in an n-th slot. In this case, the first RESETCORESET #1 is a RESET that is unavailable PDSCH reception configured forthe UE, and the second RESET RESET #2 is a RESET configured for anotherUE. The PRB scheduled for PDSCH reception of the UE overlaps the firstRESET RESET #1, but does not overlap the second RESET RESET #2. In thiscase, the last OFDM symbol of the first RESET RESET #1 is the secondOFDM symbol of the n-th slot. In addition, the last OFDM symbol of thesecond RESET RESET #2 is the first OFDM symbol of the n-th slot. In theembodiment of FIG. 14(a), the base station designates a second OFDMsymbol, which is the OFDM symbol next to the last symbol of the secondRESET RESET #2, which is not configured for the UE, as a startingsymbol. In this case, the field value of the DCI corresponding to thestarting symbol information may be 01_(b). In the frequency bandoverlapping the first RESET RESET #1 among the frequency bands in whichPDSCH reception of the UE is scheduled, the UE starts receiving thePDSCH from the OFDM symbol next to the last OFDM symbol of the firstRESET RESET #1. Moreover, in the frequency band not overlapping thefirst RESET RESET #1 among the frequency bands in which PDSCH receptionof the UE is scheduled, the UE starts receiving the PDSCH from thesecond OFDM symbol that is the OFDM symbol indicated by the startingsymbol information.

In another specific embodiment, when the time-frequency resource inwhich the physical data channel reception of the UE is scheduledoverlaps the RESET(s) not configured for the UE, the base station mayindicate the OFDM symbol next to the last OFDM symbol of the RESET(s)not configured for the UE as a starting symbol. When there is no RESETnot configured for the UE, which overlaps the time-frequency resourcesscheduled for the physical data channel reception of the UE, the basestation may designate the first OFDM symbol of the slot as a startingsymbol. In the embodiment of FIG. 14(b), since there is no RESET notconfigured for the UE, which overlaps the PRB scheduled for the PDSCHreception of the UE, the base station designates the first OFDM symbolas a starting symbol. In this case, the field value of the DCIcorresponding to the starting symbol information may be 01_(b). In thefrequency band overlapping the first RESET RESET #1 among the frequencybands in which PDSCH reception of the UE is scheduled, the UE startsPDSCH monitoring from the OFDM symbol next to the last OFDM symbol ofthe first RESET RESET #1. Moreover, in the frequency band notoverlapping the first RESET RESET #1 among the frequency bands in whichPDSCH reception of the UE is scheduled, the UE starts receiving thePDSCH from the first OFDM symbol that is the OFDM symbol indicated bythe starting symbol information.

Only some of the time-frequency resources corresponding to the CORESETincluded in the RESET may be used for physical control channeltransmission. In addition, the UE may determine the time-frequencyresource in which the physical control channel of the UE is transmittedamong time-frequency resources corresponding to RESET in which physicaldata channel reception configured for the UE is unavailable.Accordingly, frequency resources not used for physical control channeltransmission among time-frequency resources corresponding to RESET maybe used for physical data channel transmission. In this case, the UE mayassume that the physical data channel is not transmitted to thetime-frequency resource receiving the physical control channel among thetime-frequency resources corresponding to the RESET in which thephysical data channel reception configured for the UE is unavailable.The UE may receive a physical data channel by performing rate matchingon the remaining time-frequency resources except for the correspondingtime-frequency resources or by puncturing the time-frequency resources.This will be described with reference to FIGS. 15 to 16.

FIGS. 15 to 16 illustrate that a UE of a wireless communication systemaccording to an embodiment of the present invention receives a PDSCH ina RESET configured for a UE.

Regardless of whether the physical data channel reception configured forthe UE overlaps the unavailable RESET, the UE may receive the physicaldata channel from the OFDM symbol indicated by the starting symbolinformation in the frequency band in which the physical data channelreception of the UE is scheduled. In this case, when the RESETconfigured for the UE includes a CORESET and receives a physical controlchannel in the CORESET, a UE may puncture a time-frequency resource usedfor the physical control channel transmission to receive a physical datachannel. In addition, when the RESET configured for the UE includes aCORESET and the UE receives a physical control channel in thecorresponding CORESET, the UE may receive a physical data channel byperforming rate matching on the remaining time-frequency resourcesexcept for the time-frequency resources used for the correspondingphysical control channel transmission.

FIGS. 15 to 16 illustrate seven OFDM symbols of an n-th slot. In theembodiment of FIGS. 15 to 16, a first RESET RESET #1 and a second RESETRESET #2 are configured in an n-th slot. In this case, the first RESETCORESET #1 is a RESET that is unavailable PDSCH reception configured forthe UE, and the second RESET RESET #2 is a RESET configured for anotherUE. The PRB scheduled for PDSCH reception of the UE overlaps the firstRESET RESET #1, but does not overlap the second RESET RESET #2. In thiscase, the last OFDM symbol of the first RESET RESET #1 is the secondOFDM symbol of the n-th slot. In addition, the last OFDM symbol of thesecond RESET RESET #2 is the first OFDM symbol of the n-th slot. In theembodiment of FIG. 15, the PDSCH is received from the second OFDM symbolindicated by the starting symbol information in the frequency band inwhich the PDSCH reception of the UE is scheduled. In this case, the UEpunctures the PRB used for PDCCH transmission in the RESET configuredfor the UE and receives the PDSCH.

In another specific embodiment, the UE may receive the physical datachannel from the first OFDM symbol of the frequency band that overlapsthe RESET in which the physical data channel reception configured forthe UE is unavailable among the frequency bands in which physical datachannel reception is scheduled. In this case, the UE may puncture atime-frequency resource used for physical control channel transmissionin a RESET configured for the UE and receive a physical data channel. Inaddition, the UE may receive a physical data channel by performing ratematching on remaining time-frequency resources except for time-frequencyresources used for physical control channel transmission in a RESETconfigured for the UE. A UE may receive a physical data channel from anOFDM symbol indicated by starting symbol information in a frequency bandin which the physical data channel reception configured for the UE doesnot overlap the unavailable RESET among the frequency bands in which thephysical data channel reception is scheduled.

In the embodiment of FIG. 16, a UE receives a PDSCH from a first OFDMsymbol of a frequency band overlapping a RESET in which a PDSCHreception configured for a UE is unavailable among frequency bands inwhich a PDSCH reception of a UE is scheduled. In this case, the UE maypuncture the PRB used for the PDCCH transmission in the RESET in whichPDSCH reception configured for the UE is unavailable and receive thePDSCH. In addition, the UE may receive the PDSCH by performing ratematching on the remaining time-frequency resources except for the PRBused for the PDCCH transmission in the RESET in which the PDSCHreception configured for the UE is unavailable. In addition, the UEmonitors the PDSCH from the second OFDM symbol indicated by the startingsymbol information in a frequency band not overlapping the RESET inwhich the PDSCH reception configured for the UE is unavailable among thefrequency bands in which PDSCH reception of the UE is scheduled.

In such embodiments, the base station may configure the starting symbolaccording to the embodiments described with reference to FIGS. 13 to 14.

The base station may divide one slot into a plurality of frequency bandsand signal a starting symbol in each of the plurality of frequencybands. The base station may signal a plurality of starting symbolinformation corresponding to the plurality of starting symbols throughthe DCI. In this case, the UE may receive a physical data channel basedon the information of the plurality of starting symbols. This is becausea plurality of RESET(s) may be configured in one slot, and a pluralityof RESET(s) may be configured in different PRBs and OFDM symbols. Inthis case, the base station may configure the starting symbol of thecorresponding frequency band based on the latest OFDM symbol among thelast OFDM symbols of the RESET(s) in which the physical data channelreception overlapping the time-frequency resources scheduled forphysical data channel reception of the UE is unavailable in thecorresponding frequency band. In more detail, the base station mayconfigure, as a starting symbol of the corresponding frequency band, theOFDM symbol next to the latest OFDM symbol among the last OFDM symbolsof the RESET(s) in which the physical data channel reception overlappingthe time-frequency resources scheduled for physical data channelreception of the UE is unavailable in the corresponding frequency band.In this case, when there is no RESET(s) in which the physical datachannel reception overlapping the time-frequency resources scheduled forphysical data channel reception of the UE is unavailable in thecorresponding frequency band, the base station may configure the firstOFDM symbol as the starting symbol of the corresponding frequency band.

In addition, the UE may start physical data channel reception based onthe RESET in which physical data channel reception configured for UE isunavailable or the time-frequency resource scheduled for the physicaldata channel reception of a UE that overlaps a physical data channeltransmitted to the UE in the corresponding frequency band. In a specificembodiment, the UE may receive the physical data channel from the OFDMsymbol next to the last OFDM symbol of the RESET in which the physicaldata channel reception configured for the UE is unavailable, whichoverlaps the time-frequency resource scheduled for physical data channelreception of the UE in the corresponding frequency band, regardless ofthe starting symbol of the corresponding frequency band. In anotherspecific embodiment, the UE may receive the physical data channel fromthe OFDM symbol next to the last OFDM symbol of the physical controlchannel transmitted to the UE, which overlaps the time-frequencyresource scheduled for physical data channel reception of the UE in thecorresponding frequency band, regardless of the starting symbol of thecorresponding frequency band.

The base station may transmit the physical control channel and thephysical data channel scheduled by the corresponding physical controlchannel through different slots. This scheduling scheme is referred toas cross-slot scheduling. For example, the base station may transmit aphysical control channel in CORESET of the n-th slot. In this case, thephysical control channel may schedule a physical data channel of the(n+k)-th slot. In this case, n is a natural number and k is a naturalnumber greater than one. The location of a time-frequency resourceoccupied by the physical control channel mapped to the CORESETconfigured for the UE may vary in each slot. Since it is determinedwhether the CORESET is used for the physical data channel according tothe physical control channel allocation of the base station, whether aRESET including a corresponding CORESET is unavailable for physical datachannel reception may vary in each slot. Thus, when cross-slotscheduling is performed, it may be difficult for a base station or UE todetermine a time-frequency resource used for physical data channeltransmission in a slot in which a physical data channel scheduled bycross-slot scheduling is transmitted. Therefore, when cross-slotscheduling is used, a starting symbol configuration method and asignaling method corresponding to a physical data channel areproblematic. This will be described with reference to FIG. 17.

FIG. 17 illustrates that a UE receives a PDSCH when cross-slotscheduling is performed in a wireless communication system according toan embodiment of the present invention.

When the physical data channel is scheduled by cross-slot scheduling,the position of the starting symbol may be fixed to a specific OFDMsymbol of the slot in which the physical data channel is transmitted. Inthis case, the specific OFDM symbol may be configured based on the lastOFDM symbol of the RESET configured for the UE. In more detail, thespecific OFDM symbol may be the OFDM symbol next to the last OFDM symbolof the RESET configured for the UE. For example, when the last symbol ofthe RESET configured for the UE is the third OFDM symbol of thecorresponding slot, the specific OFDM symbol may be the fourth OFDMsymbol. The base station may signal a specific OFDM symbol through anRRC signal or periodically transmitted system information. In this case,the UE may determine the starting symbol corresponding to the physicaldata channel scheduled by the cross-slot scheduling based on the RRCsignal or the system information. In addition, a starting symbolcorresponding to a physical data channel scheduled by cross-slotscheduling may be configured for each of a plurality of frequency bands.In more detail, a starting symbol corresponding to a physical datachannel scheduled by cross-slot scheduling may be configured for eachPRB or every specific number of continuous PRBs. In another specificembodiment, a starting symbol corresponding to a physical data channelscheduled by cross-slot scheduling may be commonly configured in allfrequency bands of a cell. In another specific embodiment, the basestation may signal the starting symbol through the DCI of the physicalcontrol channel performing cross-slot scheduling.

The UE may receive a physical data channel by performing rate matchingon time-frequency resources except for the time-frequency resource inwhich physical data channels are scheduled and the time-frequencyresource in which the RESET is overlapped among the time-frequencyresources in which physical data channels are scheduled by cross-slotscheduling. In addition, the UE may receive a physical data channel bypuncturing the time-frequency resource in which physical data channelsare scheduled and the time-frequency resource in which the RESET isoverlapped among the time-frequency resources in which physical datachannels are scheduled by cross-slot scheduling. In addition, theoperation of the UE receiving the physical data channel may be appliedto the embodiments described above with reference to the drawings priorto FIG. 17.

As described above, the DCI scheduling the physical data channel mayindicate whether the RESET can be used for physical data channelreception by using the RESET field. In this case, the RESET field may beused for another purpose other than the above purpose. In detail, whenthe physical data channel is scheduled by cross-slot scheduling, theRESET field may indicate in which slot the physical data channel isscheduled. This is because when a physical data channel is scheduled ina future slot by cross-slot scheduling, it may be difficult for the basestation to determine which RESET cannot be used in the slot in which thephysical data channel is scheduled during cross-slot scheduling. Whenthe RESET field is used for other purposes, the UE may assume thattime-frequency resources corresponding to the configured RESET are notavailable for the physical data channel.

In the embodiment of FIG. 17, the PDCCH transmitted in the n-th slotschedules the PDSCH transmitted in the (n+1)-th slot. The position ofthe starting symbol used when receiving the PDSCH scheduled by thecross-slot scheduling in all frequency bands in the corresponding cellis the third OFDM symbol, which is the symbol next to the last symbol ofRESET #1 overlapping the PDSCH in the frequency domain. Therefore, theUE starts receiving the PDSCH from the third OFDM symbol in the (n+1)-thslot. In addition, the RESET field indicates that the PDSCH is scheduledin the (n+1)-th slot. Therefore, the UE starts receiving the PDSCH fromthe third OFDM symbol in the (n+1)-th slot.

The base station may schedule the PDSCH transmitted in a plurality ofslots using one physical control channel. This scheduling scheme isreferred to as the scheduling based on the slot-aggregation. Forexample, the base station may transmit a physical control channel inRESET of the n-th slot. In this case, the physical control channel mayschedule a physical data channel of the n-th slot, the (n+1)-th slot, .. . the (n+k)-th slot. In this case, n is a natural number and k is anatural number greater than one. The location of a time-frequencyresource occupied by the physical control channel mapped to the RESETconfigured for the UE may vary in each slot. Thus, when the schedulingbased on the slot-aggregation is performed, it may be difficult for abase station or UE to determine a time-frequency resource used forphysical data channel transmission in a slot in which a physical datachannel scheduled by the scheduling based on the slot-aggregation istransmitted. Therefore, when the scheduling based on theslot-aggregation is used, a starting symbol corresponding to a physicaldata channel configuration method and a signaling method areproblematic. This will be described with reference to FIGS. 18 to 19.

FIGS. 18 and 19 illustrates that a UE receives a PDSCH when thescheduling based on the slot-aggregation is performed in a wirelesscommunication system according to an embodiment of the presentinvention.

When the physical data channel is scheduled in a plurality of futureslots, the UE may start the physical data channel reception based on theconstant OFDM symbol position in the plurality of slots. Specifically,when a physical data channel is scheduled by the scheduling based on theslot-aggregation, the UE may start the physical data channel receptionbased on the constant OFDM symbol position in all slots in which aphysical data channel scheduled by slot-aggregation based istransmitted. Specifically, when the physical data channel is scheduledby the scheduling based on the slot-aggregation, the location of thestarting symbol corresponding to all slots in which the physical datachannel scheduled by the scheduling based on the slot-aggregation istransmitted may be configured to the same specific OFDM symbol of theslot in which the corresponding physical data channel is transmitted. Inthis case, a specific OFDM symbol may be configured based on the lastOFDM symbol in which the RESET may be located in each slot. In moredetail, the specific OFDM symbol may be the OFDM symbol next to the lastOFDM symbol of the RESET configured for the UE. For example, when thelast symbol of the configured RESET is the third OFDM symbol of thecorresponding slot, the specific OFDM symbol may be the fourth OFDMsymbol. The base station may signal a specific OFDM symbol through anRRC signal or periodically transmitted system information. In this case,the UE may determine starting symbols corresponding to all slots inwhich the physical data channel scheduled by the scheduling based on theslot-aggregation is transmitted based on the RRC signal or systeminformation. Also, starting symbols corresponding to all slots in whichthe physical data channel scheduled by the scheduling based on theslot-aggregation is transmitted may be configured for a plurality offrequency bands. In more detail, starting symbols corresponding to allslots in which a physical data channel scheduled by the scheduling basedon the slot-aggregation is transmitted may be configured for each PRB orfor a specific number of continuous PRBs. In another specificembodiment, starting symbols corresponding to all slots in which aphysical data channel scheduled by the scheduling based on theslot-aggregation is transmitted may be commonly configured in allfrequency bands of a cell. According to another specific embodiment, thebase station may signal a starting symbol through the DCI of a physicalcontrol channel for performing the scheduling based on theslot-aggregation.

When a physical data channel is scheduled in a plurality of futureslots, the UE may receive the physical data channel in the same RESET ineach of the plurality of future slots. In more detail, the RESET fieldmay be equally applied to all slots in which a physical data channelscheduled by the scheduling based on the slot-aggregation istransmitted. According to another specific embodiment, the DCI of thephysical control channel for the scheduling based on theslot-aggregation may indicate a starting symbol corresponding to any oneslot among all slots in which the physical data channel scheduled by thescheduling based on the slot-aggregation is transmitted. The RESET fieldmay indicate whether RESET can be used for physical data channelreception in any one among a plurality of slots in which a physical datachannel scheduled by the scheduling based on the slot-aggregation istransmitted. In this case, any one slot may be a slot in which aphysical control channel including a DCI scheduling a physical datachannel is transmitted. When the scheduling based on theslot-aggregation is used, the UE may assume that it cannot be used forphysical data channel reception in a time-frequency resourcecorresponding to RESET in a slot not indicated by the RESET field amongslots in which a physical data channel scheduled by the scheduling basedon the slot-aggregation is transmitted.

In the embodiment of FIG. 18, a PDCCH transmitted in an n-th slotschedules a PDSCH transmitted in an n-th slot and a PDSCH transmitted inan (n+1)-th slot. The position of the starting symbol used whenreceiving the PDSCH scheduled by the scheduling based on theslot-aggregation in all frequency bands in the corresponding cell is thethird OFDM symbol. Accordingly, the UE starts receiving the PDSCH fromthe third OFDM symbol in the n-th slot and the (n+1)-th slot.

In the above-described embodiments, the position of starting symbolscorresponding to all slots in which the physical data channel scheduledby the scheduling based on the slot-aggregation is transmitted are thesame. According to another specific embodiment, the DCI of the physicalcontrol channel for the scheduling based on the slot-aggregation mayindicate a starting symbol corresponding to any one slot among all slotsin which the physical data channel scheduled by the scheduling based onthe slot-aggregation is transmitted. In more detail, the DCI of thephysical control channel for the scheduling based on theslot-aggregation may indicate a starting symbol corresponding to thefirst slot among all slots in which the physical data channel scheduledby the scheduling based on the slot-aggregation is transmitted. Inanother specific embodiment, the DCI of the physical control channel forthe scheduling based on the slot-aggregation may indicate a startingsymbol of a slot in which the physical control channel for thescheduling based on the slot-aggregation is transmitted. In theseembodiments, the starting symbol of the slot in which the physical datachannel in which the location of the starting symbol is not indicated bythe DCI of the physical control channel for the scheduling based on theslot-aggregation may be fixed to the constant specific OFDM symbol. Forconvenience of description, the starting symbol corresponding to thephysical data channel in which the position of starting symbol is notindicated by the DCI of the physical control channel for the schedulingbased on the slot-aggregation is referred to as the remaining startingsymbol. In the method for configuring the location of the remainingstarting symbol and the signaling method, the embodiments describedabove may be identically applied to embodiment in which the positions ofstarting symbols corresponding to all slots in which physical datachannels scheduled by the scheduling based on the slot-aggregation aretransmitted are the same. Specifically, a specific OFDM symbol may beconfigured based on the last OFDM symbol of the configured RESET. Inmore detail, the specific OFDM symbol may be the OFDM symbol next to thelast OFDM symbol of the RESET configured for the UE. The base stationmay signal a specific OFDM symbol through an RRC signal or periodicallytransmitted system information. In this case, the UE may determine thepositions of the remaining starting symbols based on the RRC signal orsystem information. In addition, the remaining starting symbols may beconfigured for a plurality of frequency bands. In more detail, theremaining starting symbols may be configured for each PRB or everyspecific number of continuous PRBs. In another specific embodiment, theremaining starting symbols may be configured to be common to allfrequency bands of the cell.

In the embodiment of FIG. 19, a PDCCH transmitted in an n-th slotschedules a PDSCH transmitted in an n-th slot and a PDSCH transmitted inan (n+1)-th slot. In this case, the PDCCH indicates the starting symbolof the n-th slot as the first OFDM symbol. In addition, the position ofthe starting symbol used when receiving the remaining PDSCH in which thestarting symbol is not indicated in the PDCCH is the second OFDM symbol.Accordingly, the UE starts monitoring the PDSCH from the first OFDMsymbol in the n-th slot and starts monitoring the PDSCH from the secondOFDM symbol in the (n+1)-th slot.

In a slot after the slot in which the physical control channel for thescheduling based on the slot-aggregation is transmitted, the UE mayreceive a physical data channel by performing rate matching ontime-frequency resources except for the time-frequency resource in whichphysical data channels are scheduled and the time-frequency resource inwhich the RESET is overlapped among time-frequency resources in which aphysical data channel is scheduled by the scheduling based on theslot-aggregation, in a slot after the slot in which the physical controlchannel for the scheduling based on the slot-aggregation is transmitted.As described above, the value of the RESET field may be applied to aslot after the slot in which the physical control channel for thescheduling based on the slot-aggregation is transmitted. In this case,the UE may perform rate matching on time-frequency resources except forthe time-frequency resource in which the physical data channel isscheduled and the time-frequency resource in which the RESET withunavailable physical data channel reception is overlapped amongtime-frequency resources in which a physical data channel is scheduledby the scheduling based on the slot-aggregation. Furthermore, in a slotafter the slot in which the physical control channel for the schedulingbased on the slot-aggregation is transmitted, the UE may receive aphysical data channel by puncturing the time-frequency resource in whichphysical data channels are scheduled and the time-frequency resource inwhich the RESET is overlapped among time-frequency resources in which aphysical data channel is scheduled by the scheduling based on theslot-aggregation, in a slot after the slot in which the physical controlchannel for the scheduling based on the slot-aggregation is transmitted.As described above, the value of the RESET field may be applied to aslot after the slot in which the physical control channel for thescheduling based on the slot-aggregation is transmitted. In this case,the UE may puncture the time-frequency resource in which the physicaldata channel is scheduled and the time-frequency resource in which theRESET with unavailable physical data channel reception is overlappedamong time-frequency resources in which a physical data channel isscheduled by the scheduling based on the slot-aggregation. In addition,the operation of the UE receiving the physical data channel may beapplied to the embodiments described above with reference to thedrawings prior to FIG. 17.

The base station may divide overlapped-RESET into a plurality ofsub-resource-sets and indicate whether each of the sub-resource-sets isunavailable for physical data channel reception. In addition, the UE mayalso determine whether each of the sub-resource-sets is unavailable forphysical data channel reception. In more detail, the UE may receive fromthe base station a DCI including an N-bit field indicating Nsub-resource-sets. In this case, each bit of the N-bit field mayindicate whether each of the N sub-resource-sets is unavailable forphysical data channel reception. This will be described with referenceto FIG. 20.

FIG. 20 illustrates an example of a sub-resource-set used in a wirelesscommunication system according to an embodiment of the presentinvention.

As described above, the base station may indicate whether asub-resource-set can be used for physical data channel reception byusing an N-bit field. For convenience of description, this field isreferred to as a sub-resource-set bitmap. If there is oneoverlapped-RESET, the corresponding overlapped-RESET may be divided intoN sub-resource-sets. In this case, each bit of the sub-resource-setbitmap may indicate whether each of the N sub-resource-sets can be usedfor physical data channel reception. When the number ofoverlapped-RESETs is smaller than N, each overlapped-RESET may beconfigured as at least one sub-resource-set. When the number ofoverlapped-RESETs is greater than N, a plurality of overlapped-RESETsmay be configured as one sub-resource-set. In addition, when the numberof overlapped-RESETs is N, each of the N overlapped-RESET may beconfigured as one sub-resource-set.

When configuring one overlapped-RESET as a plurality ofsub-resource-sets, the sub-resource-set may be configured based on thetime domain without distinction in the frequency domain. In this case,the sub-resource-set may be configured based on the ODFM symbol occupiedby the overlapped-RESET. FIG. 20(a) illustrates an example of asub-resource-set configured based on the time domain.

In addition, when configuring one overlapped-RESET as a plurality ofsub-resource-sets, the sub-resource-sets may be configured based on thefrequency domain without distinction in the time domain. In this case,the sub-resource-set may be configured based on the PRB occupied by theoverlapped-RESET. In this case, the sub-resource-set may include onlycontinuous PRBs. In another specific embodiment, the sub-resource-setmay include a discontinuous PRB. In a specific embodiment,overlapped-RESET may be configured as M sub-resource-sets. In this case,when overlapped-RESET occupies X PRBs, M−1 sub-resource-sets may beconfigured to occupy floor (X/M) PRBs, and one sub-resource-set may beconfigured to occupy X−(M−1)*floor(X/M) PRB. In this case, floor(x)represents the largest natural number equal to or smaller than x. FIGS.20(b) and 20(d) illustrate an example of a sub-resource-set configuredbased on the frequency domain.

In addition, when configuring one overlapped-RESET as a plurality ofsub-resource-sets, the sub-resource-sets may be configured based on thefrequency domain. In this case, the sub-resource-set may be configuredbased on the OFDM symbol and the PRB occupied by the overlapped-RESET.In this case, the sub-resource-set may include only continuous PRBs. Inanother specific embodiment, the sub-resource-set may include adiscontinuous PRB. FIGS. 20(c) and 20(e) illustrate an example of asub-resource-set configured based on the time-frequency domain.

If the overlapped-RESET includes a plurality of RESETs, the plurality ofRESETs may be configured preferentially as a sub-resource-set. In moredetail, bits of the overlapped-RESET bitmap may be allocated to aplurality of RESETs first.

According to another specific embodiment, the base station maydistinguish time-frequency resources scheduled for physical data channelreception of a UE regardless of overlapped-RESET, and may signal whetherthe separated resources can be used for physical data channel reception.In more detail, time-frequency resources scheduled for physical datachannel reception of a UE may be equally divided into 2N based on thefrequency domain. In this case, the base station may signal whether itcan be used for physical data channel reception of the UE using the Nbit field of the L1 signaling or the N bit field of the DCI. The UE maydetermine a time-frequency resource that may be used for physical datachannel reception based on the value of the N-bit field of the L1signaling or the N-bit field of the DCI.

FIG. 21 illustrates that a UE receives a PDSCH based on overlapped-RESETin a wireless communication system according to an embodiment of thepresent invention.

As described above, if it is indicated that the PDSCH is transmitted inthe sub-resource-set in the sub-resource-set bitmap included in the DCIscheduling the physical data channel, the UE may receive the physicaldata channel in the sub-resource-set. When the PDCCH is received in thetime-frequency domain corresponding to the sub-resource-set, the UE mayreceive a physical data channel by puncturing the time-frequency domainoccupied by the physical control channel. In addition, when the physicalcontrol channel is received in the time-frequency domain correspondingto the sub-resource-set, the UE may receive the physical data channel byperforming rate matching on the remaining sub-resource-sets except forthe time-frequency domain occupied by the physical control channel. Inthe embodiment of FIG. 21, the first RESET RESET #1 and the second RESETRESET #2 are configured in the n-th slot by the RRC signal. In theembodiment of FIG. 21, a time-frequency resource scheduled for PDSCHreception of a UE by DCI overlaps a part of the first RESET RESET #1. Inaddition, the DCI does not indicate that the first RESET RESET #1 isunavailable for PDSCH reception. Accordingly, the UE determines thetime-frequency resource in which the PDSCH reception of the UE isscheduled by the DCI and the time-frequency resource in which the firstRESET RESET #1 is overlapped as an overlapped-RESET. In this case, thePDCCH is received through a time-frequency resource corresponding to theoverlapped-RESET. The UE may receive the PDSCH by puncturing thetime-frequency domain occupied by the PDCCH. In addition, the UE mayreceive the PDSCH by performing rate matching in the overlapped-RESETexcept for the time-frequency domain occupied by the PDCCH.

As described above, the base station may configure RESET using the RRCsignal. When the base station configures the RESET using the RRC signal,a method of indicating a time-frequency resource corresponding to atleast one RESET may be problematic. This will be described withreference to FIGS. 22 to 24.

The base station may signal the index of the PRB occupied by the RESETand the index of OFDM symbol occupied by the RESET to indicate atime-frequency resource corresponding to the RESET. When the RESEToccupies the continuous time-frequency resource, the base station mayindicate the continuous time-frequency resource using one indicationvalue. In this case, the indication value is referred to as a resourceindication value (MV), and this indication method is referred to as anRIV method. In more detail, the base station may generate one RIV bycombining the start positions of the continuous resources and the numberof the continuous resources. In more detail, when the RESET occupiescontinuous OFDM symbols, the base station may generate an RIV using thestart index of the OFDM symbol and the index of the last OFDM symbol. Inaddition, when RESET occupies a continuous PRB and a continuous OFDMsymbol, the base station may generate one RIV based on the index of thePRB, and generate one RIV based on the index of the OFDM symbol. In thiscase, the base station may transmit two RIV values. In another specificembodiment, one value may be generated by encoding two RIVs. In thiscase, the base station may signal only time-frequency resources occupiedby the RESET by transmitting only one generated value. A method ofgenerating the RIV will be described in detail with reference to FIGS.27 to 30.

If the time-frequency resource occupied by the RESET is noncontiguous,the base station may signal the time-frequency resource occupied by theRESET using a bitmap. In addition, when the base station signals thetime-frequency resources occupied by the RESET, the base station mayalso signal a monitoring period corresponding to the RESET. For example,when the monitoring period of the RESET is two slots, the UE maydetermine that the corresponding RESET exists every two slots. Inaddition, when the base station signals the time-frequency resourcesoccupied by the RESET, the base station may signal information on theCORESET included in the RESET. The information on the CORESET mayinclude at least one of information on Resource element group (REG)bundling and information on control channel element (CCE)-to-REGmapping.

The base station needs to signal a connection relationship between theRESET and the bit field of the L1-signaling indicating the RESET. Atthis point, the bit field may be the RESET field described above. Thebase station may indicate a bit field index of L1-signalingcorresponding to RESET to signal a connection relationship between RESETand a bit field of L1-signaling indicating the RESET. The L1-signalingmay be a DCI scheduling a physical data channel. In addition,L1-signaling may be a group-common DCI transmitted in a slot in which aphysical data channel is transmitted. According to a specificembodiment, the base station may signal a connection relationshipbetween RESET and a bit field of L1-signaling indicating RESETregardless of physical data channel allocation information. For example,the RESET field may be n bits. In order for the base station to signalthat the i-th bit of the RESET field indicates whether the RESET isunavailable for physical data reception, the base station may signal ithrough an RRC signal for configuring the corresponding RESET. If thevalue of the i-th bit of the RESET field is 1, the UE may determine thata time-frequency resource corresponding to the corresponding RESETcannot be used for physical data channel reception. In addition, whenthe value of the i-th bit of the RESET field is 0, the UE may determinethat the physical data channel is received from the time-frequencyresource corresponding to the RESET. The bits of the RESET fieldcorresponding to the RESET that do not overlap the time-frequencyresource in which the physical data channel is scheduled may be used forother purposes. In this case, a time-frequency resource in which aphysical data channel is scheduled may be indicated by a ResourceAllocation (RA) field. In more detail, it may indicate whethertime-frequency resources corresponding to different RESETs areunavailable in physical data channel reception. For example, the firstbit of the RESET field may indicate whether physical data channelreception is available in the first RESET RESET #1 and the second RESETRESET #2, and the second bit may indicate whether physical data channelreception is available in the third RESET RESET #3 and the fourth RESETRESET #4. In this case, the first PREST RESET #1 and the second RESETRESET #2 overlap the time-frequency resource in which the physical datachannel is scheduled. The third PREST RESET #3) and the fourth RESETRESET #4 do not overlap the time-frequency resource in which thephysical data channel is scheduled. In this case, the first bit of theRESET field may not indicate whether physical data channel reception isavailable in the first RESET RESET #1 and the second RESET RESET #2, andmay indicate whether physical data channel reception is available in thefirst RESET RESET #1. In addition, the first second of the RESET fieldmay not indicate whether physical data channel reception is available inthe third RESET RESET #3 and the fourth RESET RESET #4, and may indicatewhether physical data channel reception is available in the second RESETRESET #2. If all RESETs indicated by any one bit of the RESET field donot overlap the time-frequency resource in which the physical datachannel is scheduled, the corresponding bit may indicate whether aspecific CORESET or a RESET including CORSET is used for physical datachannel reception.

In another specific embodiment, the base station may signal a connectionrelationship between the RESET and a bit field of L1-signalingindicating the RESET based on the time-frequency resource in which thephysical data channel is scheduled. For example, the base station maysignal time-frequency resource information corresponding to RESET to theUE. In this case, the UE may signal the connection relationship betweenthe overlapped-RESET and the L1-signaling described above using the RRCsignal.

Alternatively, the base station may implicitly signal a connectionrelationship between the overlapped-RESET and the L1-signaling.Specifically, when overlapped-RESET is divided into a plurality ofsub-resource-sets, each of the RESET(s) may be identified by differentindices. In this case, the bit indicating the sub-resource-set among theplurality of bits constituting the rate-matching indicator may bedetermined based on an index for identifying the RESET. In a specificembodiment, the UE may map the sub-resource-sets to the bits of theRESET field in order. For example, the j-th sub-resource-set may bemapped to the ((j mod B)+1)-th bit of the RESET field. In this case, Bmay indicate the number of bits of the RESET field. In addition, X mod Ymay represent the remaining value when X is divided by Y.

Time-frequency resources corresponding to different RESETs may overlap.In this case, the physical data channel reception method may be aproblem in a time-frequency resource in which the UE corresponds to theRESET. This will be described with reference to FIGS. 22 to 24.

FIGS. 22 to 24 illustrate a case in which time-frequency resourcesindicated as occupied by different RESETs overlap.

When the base station configures the RESET for the UE, the UE may assumethat the RESETs do not overlap each other. In detail, whentime-frequency resources corresponding to different RESETs overlap, theUE may determine that the corresponding time-frequency resources areincluded in one RESET and not included in the remaining RESETs. In moredetail, the UE may determine that time-frequency resources overlapped inRESET(s) are included in any one of the RESETs according to the priorityof the RESET. In this case, the priority of the RESET may be explicitlyindicated in the RRC signal. In another specific embodiment, thepriority of RESET may be determined according to the order in whichRESET is configured in the RRC signal. In another specific embodiment,the priority of the RESET may be determined according to the bit indexof the RESET field to which the RESET is mapped. Also, the priority ofthe RESET including the CORESET monitored by the UE to receive thephysical control channel may always be the highest. In addition, thepriority of the RESET including the CORESET in which the UE receives thePDCCH may always be the highest.

In the embodiment of FIG. 22, the time-frequency resource indicated asoccupied by the first RESET RESET #1) and the time-frequency resourceindicated as occupied by the second RESET RESET #2 overlap. In theembodiment of FIG. 22A, the priority of the second RESET RESET #2 ishigher than that of the first RESET RESET #1. Therefore, thetime-frequency resource, in which the time-frequency resource indicatedas occupied by the first RESET RESET #1 and the time-frequency resourceindicated as occupied by the second RESET RESET #2 overlap, is includedin the second RESET RESET #2 and not included in the first RESET RESET#1. In the embodiment of FIG. 22(b), the priority of the first RESETRESET #1 is higher than that of the second RESET RESET #2. Therefore,the time-frequency resource, in which the time-frequency resourceindicated as occupied by the first RESET RESET #1 and the time-frequencyresource indicated as occupied by the second RESET RESET #2 overlap, isincluded in the first RESET RESET #1 and not included in the secondRESET RESET #2.

In another specific embodiment, when the base station configures theRESET for the UE, the UE may assume that the RESETs may overlap eachother. In this case, it is a problem when the bits of the RESET fieldcorresponding to different RESETs indicate different information. Forexample, it is indicated whether a bit of the bit field of theL1-signaling corresponding to the first RESET is unavailable forphysical data channel reception in the first RESET, and a bit of the bitfield of the L1-signaling corresponding to the second RESET may beindicated as being available for physical data channel reception in thesecond RESET. In this case, the UE may give priority to any information.In more detail, information indicating that it can be used for physicaldata channel reception may be given priority. In the embodiment of FIGS.23 to 24, as shown in FIG. 23(a), the time-frequency resource indicatedas occupied by the first RESET RESET #1) and the time-frequency resourceindicated as occupied by the second RESET RESET #2 overlap. In theembodiment of FIG. 23(b), the RESET field indicates that the first RESETRESET #1 is unavailable for PDSCH reception and indicates that thesecond RESET RESET #2 is available for PDSCH reception. Accordingly, theUE receives the PDSCH in the second RESET RESET #2, including thetime-frequency resource in which the first RESET RESET #1 and the secondRESET RESET #2 overlap. In the embodiment of FIG. 23(c), the RESET fieldindicates that the first RESET RESET #1 is available for PDSCH receptionand indicates that the second RESET RESET #2 is unavailable for PDSCHreception. Accordingly, the UE receives the PDSCH in the first RESETRESET #1, including the time-frequency resource in which the first RESETRESET #1 and the second RESET RESET #2 overlap.

In more detail, information indicating that it is unavailable forphysical data channel reception may be given priority. In the embodimentof FIG. 24(a), the RESET field indicates that the first RESET RESET #1is unavailable for PDSCH reception and indicates that the second RESETRESET #2 is available for PDSCH reception. Accordingly, the UE receivesthe PDSCH in the second RESET RESET #2, excluding the time-frequencyresource in which the first RESET RESET #1 and the second RESET RESET #2overlap. In the embodiment of FIG. 24(b), the RESET field indicates thatthe first RESET RESET #1 is available for PDSCH reception and indicatesthat the second RESET RESET #2 is unavailable for PDSCH reception.Accordingly, the UE receives the PDSCH in the first RESET RESET #1,excluding the time-frequency resource in which the first RESET RESET #1and the second RESET RESET #2 overlap.

In addition, when different RESETs overlap and the L1-signaling bitfields corresponding to different RESETs indicate different information,the UE may determine whether to give priority to information indicatingthat physical data channel reception is unavailable or informationindicating that physical data channel reception is available based onthe RRC signal. In addition, the UE can independently determine whichinformation is given priority for each RESET. The UE may give priorityto information indicating that physical data channel reception isunavailable in the time-frequency resource corresponding to the firstRESET, and may give priority to information indicating that physicaldata channel reception is available in the time-frequency resourcecorresponding to the second RESET.

FIG. 25 illustrates a slot configuration used in a wirelesscommunication system according to an embodiment of the presentinvention.

One slot may include seven OFDM symbols. In another specific embodiment,one slot may include 14 OFDM symbols. The slot may include a DL symbolused for DL transmission. In addition, the slot may include a UL symbolused for UL transmission. Further, when a slot is changed from DLtransmission to UL transmission or from UL transmission to DLtransmission, it may include a GAP symbol that is not used for DLtransmission or UL transmission. This is because the base station andthe UE need time to change from the transmission mode to the receptionmode or from the reception mode to the transmission mode. The GAP symbolmay be one OFDM symbol. In addition, the slot may include one OFDMsymbol for transmitting DL control information.

FIG. 25 shows eight slot configurations. In Format 0, a slot includesonly a DL symbol DL. In Format 1, a slot includes six DL symbols DL andone GAP symbol GP. In Format 2, a slot includes five DL symbols DL, oneGAP symbol GP, and one UL symbol UL. In Format 3, a slot includes fourDL symbols DL, one GAP symbol GP, and two UL symbols UL. In Format 4, aslot includes three DL symbols DL, one GAP symbol GP, and three ULsymbols UL. In Format 5, a slot includes two DL symbols DL, one GAPsymbol GP, and four UL symbols UL. In Format 6, a slot includes on DLsymbol DL, one GAP symbol GP, and five UL symbols UL. In Format 7, aslot includes six UL symbols DL and one GAP symbol GP. In Format 8, aslot includes only a UL symbol UL. For convenience of description, aslot including only a DL symbol, such as Format 0, is referred to as aDL only slot. A slot including only UL symbols, such as Format 7, isreferred to as a UL only slot. A slot including both DL and UL symbols,such as Format 1 to Format 6, is referred to as a hybrid slot. In a slotother than the UL only slot, a CORESET for PDCCH transmission may beconfigured. In this case, group-common PDCCH and UE-specific PDCCH maybe transmitted in CORESET. One or more UEs may receive a group-commonPDCCH. In addition, the group-common PDCCH may include slotconfiguration information indicating the slot configuration. In thiscase, the group-common PDCCH may include slot configuration informationof a slot in which the PDCCH is transmitted. In addition, thegroup-common PDCCH may include slot configuration information of theslot next to the slot in which the PDCCH is transmitted as well as theslot in which the PDCCH is transmitted. In addition, the group-commonPDCCH may include slot configuration information of N future slots aswell as the slot in which the PDCCH is transmitted. In this case, thefuture slot is a slot corresponding to a later time than the slot inwhich the PDCCH is transmitted. In addition, N is a natural number of 1or more. N can be changed dynamically. Moreover, N can be configured bythe RRC signal. In addition, the base station may be dynamicallyindicated to the UE in the set configured in the RRC signal.

A method of signaling slot configuration information will be describedwith reference to FIGS. 26 to 33.

FIG. 26 illustrates that a UE-specific PDCCH indicates a scheduledresource to a UE in a wireless communication system according to anembodiment of the present invention.

In the embodiment of FIG. 26, the UE-specific PDCCH for the first UE UE1indicates a time-frequency resource in which PDSCH reception of thefirst UE UE1 is scheduled. In addition, the UE-specific PDCCH for thesecond UE UE2 indicates a time-frequency resource scheduled for PUSCHreception of the second UE UE2. In this case, the base station mayindicate a continuous time-frequency resource using one indicationvalue. In more detail, in the LTE system, a base station indicates acontinuous time-frequency resource using one indication value. In thiscase, the indication value is referred to as a resource indication value(RIV), and this indication method is referred to as an RIV method. Inmore detail, RIV may indicate the starting position of a continuousresource and the number of continuous resources. The UE may determinethe starting position of the continuous resource allocated to the UE andthe number of the corresponding resources based on the RIV.

In the type-2 resource allocation of the LTE system, the RIV is used asfollows. If the DCI format of the PDCCCH is any one of 1A, 1B and 1D, orthe DCI format of the EPDCCH is any one of 1A, 1B and 1D, or the DCIformat of the MPDCCH is 6-1A, the DCI includes the MV. The base stationmay indicate continuous resources in the frequency domain in which thephysical data channel reception of the UE is scheduled using the RIV. Inthis case, the UE may obtain RB_(start), which is the start RB ofcontinuous resources, and L_(CRBs), which is the number of RBs of thecontinuous resources, in the frequency domain scheduled by the DCI,based on the RIV included in the DCI. Therefore, the base station candetermine the value of RIV according to the following equation.

 if (L_(CRBs) − 1) ≤ └N_(RB) ^(DL) / 2┘ then   RIV = N_(RB) ^(DL)(L_(CRBs) −1) + RB_(start)  else   RIV = N_(RB) ^(DL) (N_(RB) ^(DL) −L_(CRBs) + 1) + (N_(RB) ^(DL) − 1 − RB_(start) ) where L_(CRBs) ≥ 1 andshall not exceed N_(RB) ^(DL) − RB_(start) .

In this case, N^(DL) _(RB) is the total number of RBs that can be usedfor resource allocation for DL transmission. When a second type (type-2)resource allocation scheme is used for UL transmission, NDLRB may bereplaced with N^(UL) _(RB), which is the total number of RBs that can beused for resource allocation for UL transmission.

When the format of the PDCCH is 1C, the base station may indicate ascheduled resource to the UE in a plurality of RB units according to asecond type (type-2) resource allocation scheme. N_(RB) ^(step)represents the number of a plurality of RBs. In this case, the startpositions of the continuous resources indicated by the RIV that the basestation can configure are as follows.

RB_(start)=0,N _(RB) ^(step),2N _(RB) ^(step), . . . ,(└N _(RB) ^(DL) /N_(RB) ^(step)┘−1)N _(RB) ^(step)

In addition, the start positions of the continuous resources indicatedby the RIV that the base station can configure are as follows.

L _(CRBs) =N _(RB) ^(step),2N _(RB) ^(step) , . . . ,└N _(RB) ^(DL) /N_(RB) ^(step) ┘N _(RB) ^(step)

In this case, the base station may determine the value of the RIVaccording to the following equation.

if (L′_(CRBs) − 1) ≤ └N′_(RB) ^(DL) / 2┘ then  RIV = N′_(RB) ^(DL)(L′_(CRBs) − 1) + RB′_(start) else  RIV = N′_(RB) ^(DL) (N′_(RB) ^(DL) −L′_(CRBs) + 1) + (N′_(RB) ^(DL) − 1 − RB′_(start) )

In this case, N^(DL) _(RB) is the total number of RBs that can be usedfor resource allocation for DL transmission. When a second type (type-2)resource allocation scheme is used for UL transmission, N^(DL) _(RB) maybe replaced with N^(UL) _(RB), which is the total number of RBs that canbe used for resource allocation for UL transmission.

The base station may indicate continuous resources in the time domain inwhich the physical data channel reception of the UE is scheduled usingthe RIV. In this case, the UE may obtain S_(start), which is the startOFDM symbol of continuous resources, and L_(symbols), which is thenumber of OFDM symbols of the continuous resources, in the frequencydomain scheduled by the DCI, based on the RIV included in the DCI.S_(start) can be interpreted as a position in a slot. For example, whenS_(start)=0, S_(start) may indicate the first OFDM symbol of the slot.When N_(symbol) is the total number of symbols allocated to the physicaldata channel reception of the UE scheduled by the DCI, the value of RIVis determined according to the following equation.

if (L_(symbols) − 1) ≤ └N_(symbols)/2┘ then  RIV =N_(symbols)(L_(symbols) − 1) + S_(start) else  RIV =N_(symbols)(N_(symbols) − L_(symbols) + 1) + (N_(symbols) − 1 −S_(start)) where L_(symbols) ≥ 1 and shall not exceed N_(symbols) −S_(start)

The base station may indicate a scheduled resource to the UE in units ofa plurality of OFDM symbols. N_(symbol) ^(step) represents the number ofOFDM symbols. In this case, the start positions of the continuousresources indicated by the RIV that the base station can configure areas follows.

S _(start)=0,N _(symbol) ^(step),2N _(symbol) ^(step), . . . ,(└N_(symbols) /N _(symbol) ^(step)┘−1)N _(symbol) ^(step)

In addition, the number of continuous OFDM symbols of continuousresources indicated by the RIV that the base station can configure is asfollows.

L _(symbols) =N _(symbol) ^(step),2N _(symbol) ^(step), . . . ,(└N_(symbols) /N _(symbol) ^(step)┘)N _(symbol) ^(step)

The base station may configure the value of RIV according to thefollowing equation.

if (L′_(symbols) − 1) ≤ └N′_(symbols)/2┘ then  RIV =N′_(symbols)(L′_(symbols) − 1) + S′_(start) else  RIV =N′_(symbols)(N′_(symbols) − L′_(symbols) + 1) + (N′_(symbols) − 1 −S′_(start)) where L′_(symbols) = L_(symbols)/N_(symbol) ^(step) ,S′_(start) = S_(start)/N_(symbol) ^(step) and N′_(symbols) =└N_(symbols)/N_(symbol) ^(step)┘. where L′_(symbols)≥ 1 and shall notexceed N′_(symbols) − S′_(start)

FIG. 27 illustrates that a base station transmits two RIVs to a UE toindicate a scheduled time frequency domain to the UE in a wirelesscommunication system according to an embodiment of the presentinvention.

As described above, the base station may indicate a time-frequencyresource scheduled for PDSCH reception of the UE or a time-frequencyresource scheduled for PUSCH transmission of the UE using the RIV. Inthis case, the UE may receive the PDSCH or transmit the PUSCH in thetime-frequency resource indicated by the RIV. The base station mayindicate a scheduled resource to the UE using the value of the RIV inthe frequency domain and the RIV in the time domain. Specifically, thebase station may indicate the time-frequency resource scheduled for theUE by independently indicating the value of the RIV of the frequencydomain and the RIV of the time domain. For convenience of description,the RIV of the frequency domain is represented by RIV_(freq), and theRIV of the time domain is represented by RIV_(time). In a specificembodiment, the base station may indicate a time-frequency resource towhich the PDSCH is allocated by transmitting a DCI including two RIVs,that is, RIV_(freq) and RIV_(time), for scheduling PDSCH reception.

In the embodiment of FIG. 27, the base station transmits each ofRIV_(freq) and RIV_(time) through the DCI. In this case, the UE maydetermine the time frequency domain indicated by RIV_(freq) andRIV_(time) according to the above-described embodiments. Specifically,the UE obtains L_(CRB) and RB_(start) from RIV_(freq) according to theembodiments described above. In addition, the UE obtains L_(symbols) andS_(start) from RIV_(time).

If the maximum value that RIV can represent is Q, the length of bits forrepresenting RIV is [log₂ Q+1]. If the maximum number of RBs that thebase station can use for scheduling the UE is six and the maximum numberof OFDM symbols is nine, the value of RIV_(freq) is any one of 0 to 20.In this case, the value of RIV_(time) is any one of 0 to 44. Therefore,5 bits are needed to indicate RIV_(freq) and 6 bits are needed toindicate RIV_(time). Therefore, a total of 11 bits are needed toindicate a scheduled time-frequency resource to the UE. If a pluralityof RIVs can be encoded into one MV, the number of bits used fortransmitting the MV can be reduced. This will be described withreference to FIG. 28.

FIG. 28 illustrates that a base station transmits two RIVs to a UE toindicate a scheduled time frequency domain to the UE in a wirelesscommunication system according to an embodiment of the presentinvention.

The base station may indicate a scheduled time-frequency resource to theUE by transmitting one MV. In this case, one RIV may be a valuegenerated by encoding two RIVs RIV₁ and RIV₂. The two RIVs may beRIV_(freq) and RIV_(time) described above. The maximum value that RIV₁can have is represented as RIV₁ ^(max). In addition, the RIV generatedby encoding two RIV is referred to as the final RIV RIV_(total). Thebase station may determine the value of the final RIV RIV_(total)according to the following equation.

RIV_(total)=RIV₁+(RIV₁ ^(max)+1)*RIV₂.

In addition, the UE can obtain RIV₁ and RIV₂ from the final RIV_(total)according to the following equations.

RIV₁=RIV_(total) mod(RIV₁ ^(max)+1)

RIV₂=(RIV_(total)−RIV₁)/(RIV₁ ^(max)+1)

In this case, RIV₁ may be RIV_(freq). In addition, RIV₂ may beRIV_(time). When the base station schedules time-frequency resources tothe UE in one RB unit, RIV_(freq) ^(max), which is the maximum value ofRIV_(freq), may be determined according to the following equation.

RIV_(freq) ^(max) =N _(RB) ^(DL)*(N _(RB) ^(DL)+1)/2−1

When the base station schedules time-frequency resources to the UE inunits of a plurality of RBs and the number of the plurality of RBs isrepresented as N_(RB) ^(step), RIV_(freq) ^(max) may be determinedaccording to the following equation.

RIV_(freq) ^(max) =N′ _(RB) ^(DL)*(N′ _(RB) ^(DL)+1)/2−1

In this case, N′_(RB) ^(DL)=[N_(RB) ^(DL)/N_(RB) ^(step)]. In this case,NDLRB is the total number of RBs that can be used for resourceallocation for DL transmission. If RIV is used for resources for ULtransmission, the NDLRB may be replaced with NULRB, which is the totalnumber of RBs that can be used for resource allocation for ULtransmission.

In this case, RIV₂ may be RIV_(time). In addition, RIV₁ may beRIV_(freq). When the base station schedules time-frequency resources tothe UE in one OFDM unit, RIV_(time) ^(max), which is the maximum valueof RIV_(time), may be determined according to the following equation.

RIV_(freq) ^(max) =N′ _(RB) ^(DL)*(N′ _(RB) ^(DL)+1)/2−1

When the base station schedules time-frequency resources to the UE inunits of a plurality of OFDM symbols and the number of the plurality ofRBs is represented as N_(symbol) ^(step), RIVfreqmax may be determinedaccording to the following equation.

RIV_(time) ^(max) =N _(symbols)*(N _(symbols)+1)/2−1

In this case, N′_(symbols)=[N_(symbols)/N_(symbol) ^(step)].

In the embodiment of FIG. 28, the base station transmits one final RIVRIV_(total) through the DCI of the UE-specific PDCCH. The UE obtainsRIV_(time) and RIV_(freq) from the final RIV RIV_(total) according tothe embodiments described above. The UE obtains L_(CRB) and RB_(start)from RIV_(freq). In addition, the UE obtains L_(symbols) and S_(start)from RIV_(time).

In another specific embodiment, the base station may encode three ormore RIVs to generate one final RIV RIV_(total), and may transmit thefinal RIV RIV_(total) using DCI. In this case, the base station maysequentially encode two RIVs to generate a final RIV RIV_(total). Forexample, the base station may encode three RIVs RIV₁, RIV₂, and RIV₃ togenerate the final MV RIV_(total). For example, the base station mayencode three RIVs RIV₁, RIV₂, and RIV₃ to generate the final RIVRIV_(total). Thereafter, the base station may generate the final RIVRIV_(total) by encoding the middle RIV and the remaining one RIV RIV₃.

Through these embodiments, the base station can reduce the number ofbits used for MV transmission. For example, six RBs can be scheduled bythe UE, and nine OFDM symbols can be scheduled by the UE. In this case,RIVfreq may have a value of any one of 0 to 20. In addition, RIVtime mayhave a value of any one of 0 to 44. As in the above-describedembodiment, when the final RIV RIVtotal is generated by encoding RIVfreqand RIVtime, the final RIV RIVtotal may have a value of one of 0 to 944.Therefore, 10 bits are required to transmit the final RIV RIVtotal.Specifically, when the RIV follows this embodiment, the bit of the DCIused for the RIV transmission can be reduced by one bit than when thebase station transmits each of the RIV_(freq) and the RIV_(time). Table4 shows the number of bits of DCI required for RIV transmissionaccording to the number of RBs and OFDM symbols that a UE can schedulewhen transmitting RIV_(freq) and RIV_(time), respectively. In addition,Table 5 shows the number of bits of DCI required for RIV transmissionaccording to the number of RBs and OFDM symbols that a UE can schedulewhen transmitting the final RIV RIV_(total) by encoding RIV_(freq) andRIV_(time). Through Table 4 and Table 5, when transmitting a final RIVRIV_(total) by encoding a plurality of RIVs, it can be checked that thenumber of bits of DCI required for RIV transmission can be reduced.

TABLE 4 Separate # of OFDM symbols encoding 1 2 3 4 5 6 7 8 9 10 11 1213 14 # of 6 5 7 8 9 9 10 10 11 11 11 12 12 12 12 PRBs 15 7 9 10 11 1112 12 13 13 13 14 14 14 14 25 9 11 12 13 13 14 14 15 15 15 16 16 16 1650 11 13 14 15 15 16 16 17 17 17 18 18 18 18 75 12 14 15 16 16 17 17 1818 18 19 19 19 19 100 13 15 16 17 17 18 18 19 19 19 20 20 20 20

TABLE 5 Joint # of OFDM symbols encoding 1 2 3 4 5 6 7 8 9 10 11 12 1314 # of 6 5 6 7 8 9 9 10 10 10 11 11 11 11 12 PRBs 15 7 9 10 11 11 12 1212 13 13 13 14 14 14 25 9 10 11 12 13 13 14 14 14 15 15 15 15 16 50 1112 13 14 15 15 16 16 16 17 17 17 17 18 75 12 14 15 15 16 16 17 17 17 1818 18 18 19 100 13 14 15 16 17 17 18 18 18 19 19 19 19 20

In the above-described embodiments, only the case in which the final RIVRIVtotal generation and the final RIV RIVtotal transmission indicate atime-frequency resource scheduled for the DCI has been described.However, the above-described embodiments are not limited thereto, andmay also be applied to a case of indicating a time-frequency resourceusing RIV. For example, when the base station schedules time-frequencyresources through the RRC signal, the above-described embodiments may beapplied. In addition, when the base station indicates the preemptedtime-frequency resources to the UE, the above-described embodiments maybe applied. In this case, the preempted time-frequency resource mayindicate that some of the time-frequency resources already scheduled forthe UE are not scheduled for the UE.

The base station may indicate a time resource for scheduling to the UEaccording to the following embodiments. In more detail, the base stationmay configure a time resource mapping table indicating the mapping of aphysical data channel scheduled for a UE and a time resource using theRRC signal. In this case, the RRC signal may be a UE-specific RRCsignal. In addition, the base station may signal the state of themapping table using any field included in the DCI scheduling thephysical data channel reception or the physical data channeltransmission of the UE. The UE may determine the mapping table of timeresources configured by the base station based on the RRC signal, anddetermine the domain of the time resource in which the correspondingdata channel is scheduled based on one field included in the DCIscheduling the physical data channel reception or physical data channeltransmission of the UE. The number of states of the time resourcemapping table may be 16. In this case, any one field included in the DCImay be 4 bits. The time resource mapping table may include a K1 valueindicating a HARQ-ACK transmission slot, a slot in which the physicaldata channel is transmitted, the number of first OFDM symbols scheduledfor the physical data channel and the number of OFDM symbols scheduledfor the physical data channel in the slot in which the physical datachannel is transmitted, and a mapping type of a physical data channel.In this case, the mapping type of the physical data channel may indicatewhether the position of the demodulation reference signal (DMRS) isdetermined regardless of the position of the physical data channel. In aspecific embodiment, the base station may configure a slot in which thephysical data channel is transmitted, a first OFDM symbol scheduled fora physical data channel in a slot in which the physical data channel istransmitted, and the number of OFDM symbols scheduled for a physicaldata channel by using 6 bits of the RRC signal. For example, two bits ofsix bits may represent a slot in which a physical data channel istransmitted. Two bits indicating a slot in which a physical data channelis transmitted are referred to as K0. K0 may represent an indexdifference between a slot in which a UE receives a DCI and a slot inwhich a physical data channel scheduled for the UE is transmitted. Thevalue that K0 can have may be any one of 00_(b), 01_(b), 10_(b), and11_(b). When the value of K0 is 0, the slot in which the UE receives theDCI and the slot in which the scheduled physical data channel istransmitted to the UE may be the same. In addition, 4 bits of 6 bits mayindicate the first OFDM symbols scheduled for the physical data channeland the number of OFDM symbols scheduled for the physical data channelin the slot in which the physical data channel is transmitted. In thiscase, the number of OFDM symbols scheduled for the physical data channelmay be any one of 2, 4, 7, and 14. In more detail, 4 bits may be mappedas shown in Table 6 according to the first OFDM symbol scheduled for aphysical data channel and the number of OFDM symbols scheduled for aphysical data channel.

TABLE 6 State Starting symbol index Length 0 0 2 1 2 2 2 4 2 3 6 2 4 8 25 10 2 6 12 2 7 0 4 8 2 4 9 4 4 10 6 4 11 8 4 12 10 4 13 0 7 14 7 7 15 014

When configuring the OFDM symbol index of one slot with 0 to 15, eachstate may represent the following OFDM symbol. The OFDM symbol indicatedby the state value may be as follows. 0:{0,1}, 1:{2,3}, 2:{4,5},3:{6,7}, 4:{8,9}, 5:{10,11}, 6:{12,13}, 7:{0,1,2,3}, 8:{2,3,4,5},9:{4,5,6,7}, 10:{6,7,8,9}, 11:{8,9,10,11}, 12:{10,11,12,13},13:{0,1,2,3,4,5,6}, 14:{7,8,9,10,11,12,13},15:{0,1,2,3,4,5,6,7,8,9,10,11,12,13,14}. In this case, in X: {Y}, Xrepresents a state value, and Y represents an OFDM symbol indicated bythe X state.

In another specific embodiment, one bit of six bits may indicate a slotin which a physical data channel is transmitted. One bit indicating aslot in which a physical data channel is transmitted is referred to asK0. K0 may represent an index difference between a slot in which a UEreceives a DCI and a slot in which a physical data channel scheduled forthe UE is transmitted. The value that K0 can have may be any one of 0and 1. If the value of K0 is 0, the slot in which the UE receives theDCI and the slot in which the scheduled physical data channel istransmitted to the UE may be the same. If the value of K0 is 1, adifference between the index of the slot in which the UE receives theDCI and the index of the slot in which the physical data channelscheduled for the UE is transmitted may be E. In this case, E may befixed to 1 or another natural number. In addition, 5 bits of 6 bits mayindicate the first OFDM symbols scheduled for the physical data channeland the number of OFDM symbols scheduled for the physical data channelin the slot in which the physical data channel is transmitted. In thiscase, the number of OFDM symbols scheduled for the physical data channelmay be any one of 1, 2, 4, 7, and 14. In more detail, 5 bits may bemapped as shown in Table 7 according to the first OFDM symbol scheduledfor a physical data channel and the number of OFDM symbols scheduled fora physical data channel.

TABLE 7 State Starting symbol index Length 0 0 2 1 2 2 2 4 2 3 6 2 4 8 25 10 2 6 12 2 7 0 4 8 2 4 9 4 4 10 6 4 11 8 4 12 10 4 13 0 7 14 7 7 15 014 16 0 1 17 1 1 18 2 1 19 3 1 20 4 1 21 5 1 22 6 1 23 7 1 24 8 1 25 9 126 10 1 27 11 1 28 12 1 29 13 1 30 — — 31 — —

0:{0,1}, 1:{2,3}, 2:{4,5}, 3:{6,7}, 4:{8,9}, 5:{10,11}, 6:{12,13},7:{0,1,2,3}, 8:{2,3,4,5}, 9:{4,5,6,7}, 10:{6,7,8,9}, 11:{8,9,10,11},12:{10,11,12,13}, 13:{0,1,2,3,4,5,6}, 14:{7,8,9,10,11,12,13},15:{0,1,2,3,4,5,6,7,8,9,10,11,12,13,14}, 16:{0}, 17:{1}, 18:{2}, 19:{3},20:{4}, 21:{5}, 22:{6}, 23:{7}, 24:{8}, 25:{9}, 26:{10}, 27:{11},28:{12}, 29:{13}. In this case, in X: {Y}, X represents a state value,and Y represents an OFDM symbol indicated by the X state. In addition,state values 30 and 31 may be reserved. The state values 30 and 31 mayrepresent all semi-statically configured DL symbols and semi-staticallyconfigured unknown symbols, respectively. In this case, the unknownsymbol may indicate a symbol that is not configured as a UL symbol or aDL symbol. In addition, the state values 30 and 31 may represent allOFDM symbols except for the designated number of OFDM symbols at the endof the slot, respectively, among all semi-statically configured DLsymbols and all semi-statically configured unknown symbols In this case,the designated number may be a fixed number. For example, the designatednumber may be one. In addition, the designated number may be separatelydesignated for each UE. Specifically, the designated number may beconfigured for each UE by the RRC signal.

In another specific embodiment, 1 bit of 6 bits may indicate a referenceposition of a slot in which a physical data channel is transmitted. Inthis case, 1 bit may indicate whether the reference position of the slotin which the physical data channel is transmitted is the first OFDMsymbol of the slot or an OFDM symbol immediately after CORESET. 5 bitsof the 6 bits may be the number of OFDM symbols scheduled for a physicaldata channel. If 1 bit of 6 bits indicates the start time point of theslot, and the index of the OFDM starting symbol indicated by 5 bits of 6bits is A, the physical data channel is transmitted in the OFDM symbolcorresponding to the number of OFDM symbols in which the physical datachannel is transmitted. If 1 bit of 6 bits represents an OFDM symbolimmediately after CORESET, and the index of the OFDM starting symbolindicated by 5 bits of 6 bits is A, the physical data channel istransmitted in OFDM symbols corresponding to the number of OFDM symbolsin which the physical data channel is transmitted from A+B. In thiscase, B is an index of an OFDM symbol corresponding to the OFDM symbolimmediately after CORESET.

FIGS. 29 to 33 illustrate an OFDM symbol corresponding to a physicaldata channel scheduled for a UE represented by 6 bits of an RRC signalin a wireless communication system according to another embodiment ofthe present invention.

According to a specific embodiment, 6 bits of an RRC signal used by abase station to indicate a physical data channel scheduled for a UE mayindicate 14 states in which the number of OFDM symbols scheduled for thephysical data channel is 1, 2 states in which the number of OFDM symbolsscheduled for the physical data channel is 7, and 28 states in which thenumber of OFDM symbols scheduled for the physical data channel is amultiple of 2. In this case, the state in which the number of OFDMsymbols scheduled for the physical data channel is a multiple of 2 mayfollow an RIV scheme in which 14 OFDM symbols are bundled and indicated.According to a specific embodiment, the OFDM symbol that can berepresented by 6 bits may the same as that in FIG. 29.

According to a another specific embodiment, 6 bits of an RRC signal usedby a base station to indicate a physical data channel scheduled for a UEmay indicate 14 states in which the number of OFDM symbols scheduled forthe physical data channel is 1, 8 states in which the number of OFDMsymbols scheduled for the physical data channel is 7, and 28 states inwhich the number of OFDM symbols scheduled for the physical data channelis a multiple of 2. In this case, the state in which the number of OFDMsymbols scheduled for the physical data channel is a multiple of 2indicates that the state starts with an even OFDM symbol index.According to a specific embodiment, the OFDM symbol that can berepresented by 6 bits may the same as that in FIG. 30.

According to a another specific embodiment, 6 bits of an RRC signal usedby a base station to indicate a physical data channel scheduled for a UEmay indicate 14 states in which the number of OFDM symbols scheduled forthe physical data channel is 1, and 49 states in which the number ofOFDM symbols scheduled for the physical data channel is a multiple of 2.In this case, 28 states of 49 states in which the number of OFDM symbolsscheduled for the physical data channel is a multiple of 2 indicatestarting from an even OFDM symbol index, and 21 states indicate startingfrom an odd OFDM symbol index. According to a specific embodiment, theOFDM symbol that can be represented by 6 bits may the same as that inFIG. 31.

According to a another specific embodiment, 6 bits of an RRC signal usedby a base station to indicate a physical data channel scheduled for a UEmay indicate 14 states in which the number of OFDM symbols scheduled forthe physical data channel is 1, and 48 states in which the number ofOFDM symbols scheduled for the physical data channel is a multiple of 2.In this case, 28 states of 48 states in which the number of OFDM symbolsscheduled for the physical data channel is a multiple of 2 may indicatestarting from an even OFDM symbol index, and 20 states may indicatestarting from an odd OFDM symbol index. According to a specificembodiment, the OFDM symbol that can be represented by 6 bits may thesame as that in FIG. 32.

In another specific embodiment, 6 bits of an RRC signal used by a basestation to indicate a scheduled physical data channel to a UE mayindicate 14 states in which the number of OFDM symbols scheduled for thephysical data channel is 1, 8 states in which the number of OFDM symbolsscheduled for the physical data channel is 7, 13 states in which thenumber of OFDM symbols scheduled for the physical data channel is 2, 11states in which the number of OFDM symbols scheduled for the physicaldata channel is 4, one state in which the number of OFDM symbolsscheduled for the physical data channel is 14, 4 states in which thenumber of OFDM symbols scheduled for the physical data channel is 3, 2states in which the number of OFDM symbols scheduled for the physicaldata channel is 5, 2 states in which the number of OFDM symbolsscheduled for the physical data channel is 6, one state in which thenumber of OFDM symbols scheduled for the physical data channel is 8, onestate in which the number of OFDM symbols scheduled for the physicaldata channel is 9, one state in which the number of OFDM symbolsscheduled for the physical data channel is 10, one state in which thenumber of OFDM symbols scheduled for the physical data channel is 11,one state in which the number of OFDM symbols scheduled for the physicaldata channel is 12, and one state in which the number of OFDM symbolsscheduled for the physical data channel is 13. In this case, all statesin which the number of OFDM symbols scheduled for the physical datachannel is 3 may start from an OFDM symbol index corresponding to amultiple of 3. According to a specific embodiment, the OFDM symbol thatcan be represented by 6 bits may the same as that in FIG. 33.

According to a another specific embodiment, 6 bits of an RRC signal usedby a base station to indicate a physical data channel scheduled for a UEmay indicate 14 states in which the number of OFDM symbols scheduled forthe physical data channel is 1, 8 states in which the number of OFDMsymbols scheduled for the physical data channel is 7, 13 states in whichthe number of OFDM symbols scheduled for the physical data channel is 2,11 states in which the number of OFDM symbols scheduled for the physicaldata channel is 4, one state in which the number of OFDM symbolsscheduled for the physical data channel is 14, 10 states in which thenumber of OFDM symbols scheduled for the physical data channel is 5, and7 states in which the number of OFDM symbols scheduled for the physicaldata channel is 8. In this case, a state in which the number of OFDMsymbols scheduled for the physical data channel is 1 may indicatestarting from all possible OFDM symbol indices.

According to a another specific embodiment, 6 bits of an RRC signal usedby a base station to indicate a physical data channel scheduled for a UEmay indicate 14 states in which the number of OFDM symbols scheduled forthe physical data channel is 1, 8 states in which the number of OFDMsymbols scheduled for the physical data channel is 7, 13 states in whichthe number of OFDM symbols scheduled for the physical data channel is 2,11 states in which the number of OFDM symbols scheduled for the physicaldata channel is 4, one state in which the number of OFDM symbolsscheduled for the physical data channel is 14, 12 states in which thenumber of OFDM symbols scheduled for the physical data channel is 3, and5 states in which the number of OFDM symbols scheduled for the physicaldata channel is 10. In this case, a state in which the number of OFDMsymbols scheduled for the physical data channel is 1 may indicatestarting from all possible OFDM symbol indices.

According to a another specific embodiment, 6 bits of an RRC signal usedby a base station to indicate a physical data channel scheduled for a UEmay indicate 14 states in which the number of OFDM symbols scheduled forthe physical data channel is 1, 8 states in which the number of OFDMsymbols scheduled for the physical data channel is 7, 13 states in whichthe number of OFDM symbols scheduled for the physical data channel is 2,11 states in which the number of OFDM symbols scheduled for the physicaldata channel is 4, one state in which the number of OFDM symbolsscheduled for the physical data channel is 14, 9 states in which thenumber of OFDM symbols scheduled for the physical data channel is 6, 6states in which the number of OFDM symbols scheduled for the physicaldata channel is 9, and 2 states in which the number of OFDM symbolsscheduled for the physical data channel is 11. In this case, a state inwhich the number of OFDM symbols scheduled for the physical data channelis 1 may indicate starting from all possible OFDM symbol indices.

In the above, a method of representing a time-frequency resourcescheduled for a UE using RIV has been described. The base station mayuse the RIV to indicate a continuous resource in the time domain,scheduled for the UE. In this case, the base station may indicate thelocation of the starting symbol of the scheduled continuous resource tothe UE using the index of the reference OFDM symbol. The index of thestart OFDM symbol indicated by RIV is obtained by subtracting the indexof the reference OFDM symbol from the start OFDM symbol of thetime-frequency resource scheduled for the UE. In more detail, the basestation may signal an index of a reference OFDM symbol using an RRCsignal. In addition, the base station may determine the RIV valueaccording to the following equation.

if (L_(symbols) − 1) ≤ └N_(symbols)/2┘ then  RIV =N_(symbols)(L_(symbols) − 1) + S_(start)′ else  RIV =N_(symbols)(N_(symbols) − L_(symbols) + 1) + (N_(symbols) − 1 −S_(start)′) where L_(symbols) ≥ 1 and shall not exceed N_(symbols) −S_(start)′

L_(symbols) represents the number of OFDM symbols of time resourcesscheduled for the UE. In addition, S_(start) is an index of the obtainedstart OFDM symbol of the time resource scheduled for the UE based on theindex of the reference OFDM symbol. Therefore, the start OFDM symbolindex of the time resource scheduled for the UE can be obtainedaccording to the following equation.

S _(start) =S _(start) ′+R

In this case, R is an index of a reference OFDM symbol. When using thereference OFDM symbol in this way, it is possible to reduce the memorysize that the UE has to prepare for data channel reception. In addition,these embodiments may reduce the number of bits of the field used totransmit the RIV.

Previously, it has been described that the base station can configurethe index of the reference OFDM symbol by using the RRC signal. Inanother specific embodiment, the UE may assume the index of thereference OFDM symbol as the first OFDM symbol of the slot. In anotherspecific embodiment, the UE may determine the index of the referenceOFDM symbol based on the CORESET transmitted by the DCI scheduling thephysical data channel reception of the UE. For example, the UE maydetermine the first OFDM symbol index of the CORESET to which the DCIscheduling the physical data channel reception of the UE is transmittedas the index of the reference OFDM symbol. In another specificembodiment, the UE may determine the index of the OFDM symbolimmediately after the last OFDM symbol of the CORESET, in which the DCIscheduling time resource for the UE is transmitted, as the index of thereference OFDM symbol. When the index of the first OFDM symbol of theCORESET in which the DCI scheduling the physical data channel receptionof the UE for the UE is K, and the number of OFDM symbols correspondingto time resources occupied by the CORESET is A, the index of thereference OFDM symbol may be referred to as K+A. The number of bitsrequired for RRC signal transmission can be reduced than when an indexof a reference OFDM symbol is signaled through the RRC signal.

In another specific embodiment, the UE may determine the index of thereference OFDM symbol based on the CORESET transmitted by the DCIscheduling the physical data channel reception of the UE and the abovedescribed K0 value. K0 represents the slot in which the PDSCH isscheduled. If K0=0, it indicates that slots in which the DCI schedulingthe physical data channel reception of the UE for the UE and thecorresponding physical data channel are transmitted are the same as eachother. In addition, when K0=1, it indicates that the correspondingphysical data channel is transmitted after the slot immediately afterthe slot in which the DCI scheduling the physical data channel receptionof the UE is transmitted to the UE. In a specific embodiment, if K0 isgreater than 0, the UE may determine that the index of the referenceOFDM symbol is 0. In addition, if K0 is equal to 0, the UE may determinethe index of the reference OFDM symbol as the first OFDM symbol of theCORESET in which the DCI scheduling the physical data channel receptionfor the UE is transmitted. In another specific embodiment, if K0 isequal to 0, the UE may determine the index of the reference OFDM symbolas a value obtained by adding the number of OFDM symbols correspondingto the time resource occupied by the CORESET to the index of the firstOFDM symbol of the CORESET to which the DCI scheduling the physical datachannel reception of the UE is transmitted. In such an embodiment, theUE may perform different operations when cross-scheduling is performedor not, thereby reducing the number of bits required for RIVtransmission. In addition, the number of bits required for RRC signaltransmission can be reduced than when an index of a reference OFDMsymbol is signaled through the RRC signal.

In another specific embodiment, the UE may determine the index of thereference OFDM symbol based on the mapping type of the physical datachannel received by the UE. In this case, the mapping type of thephysical data channel may indicate whether the position of thedemodulation reference signal (DMRS) is determined regardless of theposition of the physical data channel. In addition, the physical channelreceived by the UE may be a PDSCH. In more detail, a mapping type of aphysical data channel may be classified into a type A and a type B. TypeA may indicate that the position of the DMRS is fixed at OFDM symbolindex 2 or 3 in the slot. In this case, the position of the DMRS may beindicated by a physical broadcast channel (PBCH). In addition, the typeB may indicate that the first DMRS is located in the first OFDM symbolof the physical data channel. When the mapping type of the physical datachannel is the type A, the UE may determine that the index of thereference OFDM symbol is 0. In addition, when the mapping type of thephysical data channel is the type B, the UE may determine the index ofthe reference OFDM symbol as the index of the first OFDM symbol of theCORESET in which the DCI scheduling the physical data channel receptionfor the UE is transmitted. In another specific embodiment, when themapping type of the physical data channel is the type B, The UE maydetermine the index of the reference OFDM symbol as a value obtained byadding the number of OFDM symbols corresponding to the time resourceoccupied by the corresponding CORESET to the index of the first OFDMsymbol of the CORESET to which the DCI scheduling the physical datachannel reception of the UE is transmitted.

In another specific embodiment, the UE may determine the index of thereference OFDM symbol based on the location of the DCI scheduling thephysical data channel reception of the UE. In more detail, when the DCIscheduling the physical data channel reception of the UE is locatedbefore a predetermined OFDM symbol, the UE may determine that the indexof the reference OFDM symbol is 0. In addition, when the DCI schedulingthe physical data channel reception of the UE is located before apredetermined OFDM symbol, the UE may determine the index of thereference OFDM symbol as the index of the first OFDM symbol of theCORESET in which the DCI scheduling the physical data channel receptionof the UE is transmitted. In another specific embodiment, when the DCIscheduling the physical data channel reception of the UE is locatedbefore a predetermined OFDM symbol, the UE may determine the index ofthe reference OFDM symbol as the sum obtained by adding the number ofOFDM symbols corresponding to the time resources occupied by thecorresponding CORESET to the index of the first OFDM symbol of theCORESET in which the DCI scheduling the physical data channel receptionof the UE is transmitted. The position of the predetermined OFDM symbolmay be the same as the position of DMRS when the mapping type of thephysical data channel received by the UE configured by the PBCH is thetype A. In more detail, when the mapping type of the physical datachannel is the type A and the PBCH indicates the second OFDM symbol bythe position of DMRS, the position of the predetermined OFDM symbol maybe the second OFDM symbol. In addition, when the mapping type of thephysical data channel is the type A and the PBCH indicates the thirdOFDM symbol by the position of DMRS, the position of the predeterminedOFDM symbol may be the third OFDM symbol.

In another specific embodiment, the UE may determine the index of thereference OFDM symbol based on the CORESET in which the DCI schedulingthe physical data channel reception of the UE is transmitted, the K0value described above, and whether the DCI scheduling the physical datachannel reception of the UE is located before a predetermined OFDMsymbol. K0 represents the slot in which the PDSCH is scheduled. In aspecific embodiment, when K0 is greater than 0 or the DCI scheduling thephysical data channel reception of the UE is located before apredetermined OFDM symbol, the UE may determine that the index of thereference OFDM symbol is 0. In addition, when K0 is equal to 0 or theDCI scheduling the physical data channel reception of the UE is notlocated before a predetermined OFDM symbol, the UE may determine theindex of the reference OFDM symbol as the first OFDM symbol of theCORESET in which the DCI scheduling the physical data channel receptionof the UE is transmitted. In another specific embodiment, when K0 isequal to 0 and the DCI scheduling the physical data channel reception ofthe UE is not located before a predetermined OFDM symbol, the UE maydetermine the index of the reference OFDM symbol as the sum obtained byadding the number of OFDM symbols corresponding to the time resourcesoccupied by the CORESET to the index of the first OFDM symbol of theCORESET in which the DCI scheduling the physical data channel receptionof the UE is transmitted. In such an embodiment, the UE may performdifferent operations when cross-scheduling is performed or not, therebyreducing the number of bits required for RIV transmission. In addition,the number of bits required for RRC signal transmission can be reducedthan when an index of a reference OFDM symbol is signaled through theRRC signal.

In another specific embodiment, the UE may determine the index of thereference OFDM symbol based on the CORESET monitored by the UE.Specifically, when a plurality of CORESETs monitored by a UE areconfigured in one slot, the UE may determine the index of the referenceOFDM symbol as the earliest OFDM symbol among the OFDM symbols occupiedby the plurality of CORESETs. This is because it may be difficult forthe UE to determine through which CORESET among the plurality ofCORESETs the base station transmits the physical control channel.According to this embodiment, the UE may receive the physical datachannel even if the physical control channel is transmitted to anyCORESET among the plurality of CORESETs.

In another specific embodiment, when the CORESET in which the DCIscheduling the physical data channel reception of the UE is transmittedis located in a slot different from the slot in which the correspondingphysical data channel is transmitted, the UE may determine the index ofthe reference OFDM symbol as 0. In addition, when the CORESET in whichthe DCI scheduling the physical data channel reception of the UE istransmitted is located in the same slot as the slot in which thecorresponding physical data channel is transmitted, the UE may determinethe index of the reference OFDM symbol as the first OFDM symbol of theCORESET in which the DCI scheduling the physical data channel receptionof the UE is transmitted. According to another specific embodiment, whenthe CORESET in which the DCI scheduling the physical data channelreception of the UE is transmitted is located in the same slot as theslot in which the corresponding physical data channel is transmitted,the UE may determine the index of the reference OFDM symbol as a valueobtained by adding the number of OFDM symbols corresponding to the timeresource occupied by the CORESET to the index of the first OFDM symbolof the CORESET in which the DCI scheduling the physical data channelreception of the UE is transmitted.

In addition, when the DCI schedules reception of the physical datachannel of the UE, the UE may not expect that the first OFDM symbol andthe last OFDM symbol of the time-frequency resource in which thephysical data channel reception of the UE is scheduled are located indifferent slots. Specifically, the UE may determine the last OFDM symbolof the time-frequency resource in which the reception of the physicaldata channel of the UE is scheduled as the last OFDM symbol of the slotin which the start OFDM symbol of the time-frequency resource scheduledfor reception of the physical data channel of the UE is located or thesymbol before the last OFDM symbol. For example, the number of OFDMsymbols included in the slot may be 14, and the DCI may indicate thefirst OFDM symbol of the time-frequency resource in which the physicaldata channel reception of the UE is scheduled as the seventh OFDMsymbol. In this case, when the number of OFDM symbols occupied by thetime-frequency resource scheduled for the physical data channelreception of the UE, which is indicated by the DCI, is 7, the UE maydetermine the OFDM symbol scheduled for the physical data channelreception of the UE as the seventh OFDM symbol to the fourteenth OFDMsymbol. In the above-described embodiments, the physical data channelreceived by the UE may be a PDSCH.

The embodiment in which the base station indicates the position of thestarting symbol of the continuous resource scheduled for the UE usingthe index of the reference OFDM symbol can also be applied a case inwhich the base station schedules the physical channel transmission ofthe UE. In more detail, the UE may determine the index of the referenceOFDM symbol as the first OFDM symbol of the slot. The OFDM symbolmentioned in relation to the physical channel transmission of the UE maybe a DFT-S-OFDM symbol.

In another specific embodiment, the UE may determine the index of thereference OFDM symbol based on the mapping type of the physical datachannel transmitted by the UE. In this case, the mapping type of thephysical data channel transmitted by the UE may indicate whether thelocation of the DMRS is determined regardless of the location of thephysical data channel. In addition, the physical channel transmitted bythe UE may be a PUSCH. In addition, the mapping type of the physicaldata channel transmitted by the UE may be configured through theUL-DMRS-config-type transmitted through the RRC signal. In more detail,a mapping type of a physical data channel may be classified into a typeA and a type B. The type A may indicate that the position of the firstDMRS is fixed in the slot. In addition, the type B may indicate that thefirst DMRS is located in the first OFDM symbol of the physical datachannel. When the mapping type of the physical data channel is the typeA, the UE may determine the index of the reference OFDM symbol as theindex of the first OFDM symbol corresponding to the physical datachannel. When the mapping type of the physical data channel is the typeB, the UE may determine that the index of the reference OFDM symbol is0.

In another specific embodiment, the UE may determine the index of thereference OFDM symbol based on the mapping type of the physical datachannel transmitted by the UE and the UL transmission waveform. The UEmay perform UL transmission using any one of CP-OFDM and DFT-S-OFDM. Thebase station may configure whether the UE uses one of CP-OFDM andDFT-S-OFDM using the RRC signal. When the mapping type of the physicaldata channel is the type B, the UE may determine that the index of thereference OFDM symbol is 0. If the mapping type of the physical datachannel is the type A and the UE is configured to use the DFT-S-OFDMwaveform, the UE may determine the index of the reference OFDM symbol asthe index of the OFDM symbol next to the OFDM symbol in which the firstDMRS is located. This is because a DFT-S-OFDM symbol used as a UL DMRSmay not be used for physical data channel UL transmission. In addition,if the mapping type of the physical data channel is type A and the UE isconfigured to use a CP-OFDM waveform, the UE may determine the index ofthe reference OFDM symbol as the index of the OFDM symbol in which thefirst DMRS is located.

In another specific embodiment, the UE may determine the index of thereference OFDM symbol based on the semi-statically configured symbolconfiguration. In more detail, the UE may determine the index of thereference OFDM symbol as the index of the unknown symbol immediatelyafter the DL symbol in the slot in which the physical data channel ofthe UE is scheduled. In another specific embodiment, the UE maydetermine the index of the reference OFDM symbol as a value obtained byadding the number of GAP symbols to the index of the unknown symbolimmediately after the DL symbol in the slot in which the physical datachannel of the UE is scheduled. The number of GAP symbols may bedetermined based on a timing advance (TA) value and an OFDM symbollength. In another specific embodiment, the number of GAP symbols may beconfigured by the base station. In addition, when the DL data channel isscheduled for the unknown symbol, the UE may regard the unknown symbolas a DL symbol. In addition, when the UL data channel is scheduled forthe unknown symbol, the UE may regard the unknown symbol as a UL symbol.

In addition, when the DCI schedules transmission of the physical datachannel of the UE, the UE may not expect that the first OFDM symbol andthe last OFDM symbol of the time-frequency resource in which thephysical data channel transmission of the UE is scheduled are located indifferent slots. Specifically, the UE may determine the last OFDM symbolof the time-frequency resource in which the transmission of the physicaldata channel of the UE is scheduled as the last OFDM symbol of the slotin which the start OFDM symbol of the time-frequency resource scheduledfor transmission of the physical data channel of the UE is located orthe symbol before the last OFDM symbol. For example, the number of OFDMsymbols included in the slot may be 14, and the DCI may indicate thefirst OFDM symbol of the time-frequency resource in which the physicaldata channel transmission of the UE is scheduled as the seventh OFDMsymbol. In this case, when the number of OFDM symbols occupied by thetime-frequency resource scheduled for the physical data channeltransmission of the UE, which is indicated by the DCI, is 7, the UE maydetermine the OFDM symbol scheduled for the physical data channeltransmission of the UE as the seventh OFDM symbol to the fourteenth OFDMsymbol. In the above-described embodiments, the physical data channeltransmitted by the UE may be a PUSCH.

In the above-described embodiments, the physical data channel mayinclude a PDSCH or a PUSCH. In addition, the physical control channelmay include a PDCCH or a PUCCH. In addition, in the embodiment describedusing PUSCH, PDCCH, PUCCH, and PDCCH, other types of data channels andcontrol channels may be applied.

The method and system of the present disclosure are described inrelation to specific embodiments, configuration elements, a part of orthe entirety of operations of the present disclosure may be implementedusing a computer system having general purpose hardware architecture.

The aforementioned description of the present disclosure has beenpresented for the purposes of illustration and description. It isapparent to a person having ordinary skill in the art to which thepresent disclosure relates that the present disclosure can be easilymodified into other detailed forms without changing the technicalprinciple or essential features of the present disclosure. Therefore,these embodiments as described above are only proposed for illustrativepurposes and do not limit the present disclosure. For example, eachcomponent described to be of a single type can be implemented in adistributed manner. Likewise, components described to be distributed canbe implemented in a combined manner.

The scope of the present disclosure is presented by the accompanyingClaims rather than the aforementioned description. It should beunderstood that all changes or modifications derived from thedefinitions and scopes of the Claims and their equivalents fall withinthe scope of the present disclosure.

1-20. (canceled)
 21. A terminal of a wireless communication system, theterminal comprising: a communication module; and a processor configuredto control the communication module, wherein the processor is configuredto: receive a radio resource control (RRC) signal from a base station ofthe wireless communication system through the communication module,determine a first time-frequency resource corresponding to at least oneresource-set indicated by the RRC signal, receive a physical controlchannel from the base station through the communication module, whereinthe physical control channel schedules physical data channel in aplurality of slots, determine a second time-frequency resource in whichthe physical data channel reception of the terminal is scheduled by thephysical control channel, wherein the first time-frequency resourceoverlaps the second time-frequency resource, wherein the overlappingtime-frequency resource includes a plurality of sub-resource-sets,obtain a rate-matching indicator from the physical control channel, andreceive a physical data channel according to the rate-matchingindicator, wherein the resource-set is a set of time-frequencyresources.
 22. The terminal of claim 21, wherein the sub-resource-set isdivided based on a frequency domain among the overlapping time-frequencyresources without distinction in a time domain.
 23. The terminal ofclaim 21, wherein the at least one resource-set are respectivelyidentified by indices which are different from each other, wherein therate-matching indicator is composed of a plurality of bits, wherein asub-resource-set indicated by each of the plurality of bits isdetermined based on the indices.
 24. The terminal of claim 21, whereinwhen the second time-frequency resource and all of the at least oneresource-set do not overlap, the processor is configured to receive thephysical data channel in the second time-frequency resource, regardlessof the rate-matching indicator.
 25. The terminal of claim 21, whereinthe physical control channel is received in a first slot, wherein whenthe second time-frequency and the at least one resource-set overlap in asecond slot in which the physical data channel is received, theprocessor is configured to perform rate matching to receive the physicaldata channel in a time-frequency resource except for a time-frequencyresource in which the at least one resource-set overlaps with atime-frequency in which the physical data channel is scheduled in atime-frequency resource in which a physical data channel is scheduled inthe second slot, wherein the first slot and the second slot aredifferent from each other.
 26. An operation method of a terminal of awireless communication system, the method comprising: receiving a radioresource control (RRC) signal from a base station of the wirelesscommunication system; determining a first time-frequency resourcecorresponding to at least one resource-set indicated by the RRC signal;receiving a physical control channel from the base station, wherein thephysical control channel schedules physical data channel in a pluralityof slots; determining a second time-frequency resource in which thephysical data channel reception of the terminal is scheduled by thephysical control channel wherein the first time-frequency resourceoverlaps the second time-frequency resource, wherein the overlappingtime-frequency resource includes a plurality of sub-resource-sets,obtaining a rate-matching indicator from the physical control channel;and receiving a physical data channel according to the rate-matchingindicator, wherein the resource-set is a set of time-frequencyresources.
 27. The operation method of claim 26, wherein thesub-resource-set is divided based on a frequency domain among theoverlapping time-frequency resources without distinction in a timedomain.
 28. The operation method of claim 26, wherein the at least oneresource-set are respectively identified by indices which are differentfrom each other, wherein the rate-matching indicator is composed of aplurality of bits, wherein a sub-resource-set indicated by each of theplurality of bits is determined based on the indices.
 29. The operationmethod of claim 26, wherein the receiving the physical data channelcomprises, when the second time-frequency resource and all of the atleast one resource-set do not overlap, receiving the physical datachannel in the second time-frequency resource, regardless of therate-matching indicator.
 30. The operation method of claim 26, whereinthe physical control channel is received in a first slot, wherein thereceiving the physical data channel comprises, when the secondtime-frequency resource and the at least one resource-set overlap in asecond slot in which the physical data channel is received, performingrate matching to receive the physical data channel in a time-frequencyresource except for a time-frequency resource in which a time-frequencyresource in which the at least one resource-set overlaps with atime-frequency in which the physical data channel is scheduled in atime-frequency resource in which a physical data channel is scheduled inthe second slot, wherein the first slot and the second slot aredifferent from each other.